diff --git a/code/botlib/be_aas_reach.c b/code/botlib/be_aas_reach.c
index e23083e3..379948aa 100644
--- a/code/botlib/be_aas_reach.c
+++ b/code/botlib/be_aas_reach.c
@@ -2108,7 +2108,7 @@ int AAS_Reachability_Jump(int area1num, int area2num)
 	int stopevent, areas[10], numareas;
 	float phys_jumpvel, maxjumpdistance, maxjumpheight, height, bestdist, speed;
 	vec_t *v1, *v2, *v3, *v4;
-	vec3_t beststart, beststart2 = {0}, bestend, bestend2 = {0};
+	vec3_t beststart = {0}, beststart2 = {0}, bestend = {0}, bestend2 = {0};
 	vec3_t teststart, testend, dir, velocity, cmdmove, up = {0, 0, 1}, sidewards;
 	aas_area_t *area1, *area2;
 	aas_face_t *face1, *face2;
@@ -3152,7 +3152,7 @@ aas_lreachability_t *AAS_FindFaceReachabilities(vec3_t *facepoints, int numpoint
 	int facenum, edgenum, bestfacenum;
 	float *v1, *v2, *v3, *v4;
 	float bestdist, speed, hordist, dist;
-	vec3_t beststart, beststart2 = {0}, bestend, bestend2 = {0}, tmp, hordir, testpoint;
+	vec3_t beststart = {0}, beststart2 = {0}, bestend = {0}, bestend2 = {0}, tmp, hordir, testpoint;
 	aas_lreachability_t *lreach, *lreachabilities;
 	aas_area_t *area;
 	aas_face_t *face;
diff --git a/code/botlib/l_precomp.c b/code/botlib/l_precomp.c
index a98213a4..e0438e89 100644
--- a/code/botlib/l_precomp.c
+++ b/code/botlib/l_precomp.c
@@ -2086,9 +2086,12 @@ int PC_EvaluateTokens(source_t *source, token_t *tokens, signed long int *intval
 			//remove the second value if not question mark operator
 			if (o->operator != P_QUESTIONMARK) v = v->next;
 			//
-			if (v->prev) v->prev->next = v->next;
-			else firstvalue = v->next;
-			if (v->next) v->next->prev = v->prev;
+			if (v)
+			{
+				if (v->prev) v->prev->next = v->next;
+				else firstvalue = v->next;
+				if (v->next) v->next->prev = v->prev;
+			}
 			//FreeMemory(v);
 			FreeValue(v);
 		} //end if
diff --git a/code/game/ai_dmq3.c b/code/game/ai_dmq3.c
index b0b78066..f0dfcaca 100644
--- a/code/game/ai_dmq3.c
+++ b/code/game/ai_dmq3.c
@@ -1487,7 +1487,7 @@ EasyClientName
 char *EasyClientName(int client, char *buf, int size) {
 	int i;
 	char *str1, *str2, *ptr, c;
-	char name[128];
+	char name[128] = {0};
 
 	ClientName(client, name, sizeof(name));
 	
diff --git a/code/game/ai_team.c b/code/game/ai_team.c
index 93e7af5d..2077eff8 100644
--- a/code/game/ai_team.c
+++ b/code/game/ai_team.c
@@ -1757,7 +1757,7 @@ BotHarvesterOrders
 */
 void BotHarvesterOrders(bot_state_t *bs) {
 	int numteammates, defenders, attackers, i;
-	int teammates[MAX_CLIENTS];
+	int teammates[MAX_CLIENTS] = {0};
 	char name[MAX_NETNAME];
 
 	//sort team mates by travel time to base
diff --git a/code/game/bg_misc.c b/code/game/bg_misc.c
index 9a271098..41594096 100644
--- a/code/game/bg_misc.c
+++ b/code/game/bg_misc.c
@@ -1087,7 +1087,6 @@ qboolean BG_CanItemBeGrabbed( int gametype, const entityState_t *ent, const play
 		// don't pick up if already at max
 #ifdef MISSIONPACK
 		if( bg_itemlist[ps->stats[STAT_PERSISTANT_POWERUP]].giTag == PW_GUARD ) {
-			upperBound = ps->stats[STAT_MAX_HEALTH];
 		}
 		else
 #endif
diff --git a/code/game/g_items.c b/code/game/g_items.c
index 3e36e382..da8b7a8a 100644
--- a/code/game/g_items.c
+++ b/code/game/g_items.c
@@ -348,6 +348,10 @@ RespawnItem
 ===============
 */
 void RespawnItem( gentity_t *ent ) {
+	if (!ent) {
+		return;
+	}
+
 	// randomly select from teamed entities
 	if (ent->team) {
 		gentity_t	*master;
diff --git a/code/game/g_mover.c b/code/game/g_mover.c
index b7948777..756c0dd0 100644
--- a/code/game/g_mover.c
+++ b/code/game/g_mover.c
@@ -881,6 +881,10 @@ void Think_SpawnNewDoorTrigger( gentity_t *ent ) {
 	vec3_t		mins, maxs;
 	int			i, best;
 
+	if (!ent) {
+		return;
+	}
+
 	// set all of the slaves as shootable
 	for ( other = ent ; other ; other = other->teamchain ) {
 		other->takedamage = qtrue;
diff --git a/code/game/g_svcmds.c b/code/game/g_svcmds.c
index b251ab35..755a7da3 100644
--- a/code/game/g_svcmds.c
+++ b/code/game/g_svcmds.c
@@ -132,11 +132,11 @@ UpdateIPBans
 */
 static void UpdateIPBans (void)
 {
-	byte	b[4];
-	byte	m[4];
+	byte	b[4] = {0};
+	byte	m[4] = {0};
 	int		i,j;
-	char	iplist_final[MAX_CVAR_VALUE_STRING];
-	char	ip[64];
+	char	iplist_final[MAX_CVAR_VALUE_STRING] = {0};
+	char	ip[64] = {0};
 
 	*iplist_final = 0;
 	for (i = 0 ; i < numIPFilters ; i++)
@@ -178,7 +178,7 @@ qboolean G_FilterPacket (char *from)
 {
 	int		i;
 	unsigned	in;
-	byte m[4];
+	byte m[4] = {0};
 	char *p;
 
 	i = 0;
diff --git a/code/opus-1.1/src/opus_decoder.c b/code/opus-1.1/src/opus_decoder.c
index 4d03770d..0ba3a058 100644
--- a/code/opus-1.1/src/opus_decoder.c
+++ b/code/opus-1.1/src/opus_decoder.c
@@ -215,7 +215,7 @@ static int opus_decode_frame(OpusDecoder *st, const unsigned char *data,
    VARDECL(opus_val16, pcm_transition_silk);
    int pcm_transition_celt_size;
    VARDECL(opus_val16, pcm_transition_celt);
-   opus_val16 *pcm_transition;
+   opus_val16 *pcm_transition=NULL;
    int redundant_audio_size;
    VARDECL(opus_val16, redundant_audio);
 
diff --git a/code/opusfile-0.5/src/opusfile.c b/code/opusfile-0.5/src/opusfile.c
index aaabdd1c..73b95de6 100644
--- a/code/opusfile-0.5/src/opusfile.c
+++ b/code/opusfile-0.5/src/opusfile.c
@@ -317,7 +317,7 @@ struct OpusSeekRecord{
 static int op_get_prev_page_serial(OggOpusFile *_of,OpusSeekRecord *_sr,
  opus_int64 _offset,ogg_uint32_t _serialno,
  const ogg_uint32_t *_serialnos,int _nserialnos){
-  OpusSeekRecord preferred_sr;
+  OpusSeekRecord preferred_sr={0};
   ogg_page       og;
   opus_int64     begin;
   opus_int64     end;
@@ -930,7 +930,7 @@ static int op_find_initial_pcm_offset(OggOpusFile *_of,
   prev_packet_gp=pcm_start;
   for(pi=0;pi<op_count;pi++){
     if(cur_page_eos){
-      ogg_int64_t diff;
+      ogg_int64_t diff=0;
       OP_ALWAYS_TRUE(!op_granpos_diff(&diff,cur_page_gp,prev_packet_gp));
       diff=durations[pi]-diff;
       /*If we have samples to trim...*/
@@ -1128,7 +1128,7 @@ static int op_bisect_forward_serialno(OggOpusFile *_of,
     opus_int64  bisect;
     opus_int64  next;
     opus_int64  last;
-    ogg_int64_t end_offset;
+    ogg_int64_t end_offset=0;
     ogg_int64_t end_gp;
     int         sri;
     serialnos=*_serialnos;
@@ -2114,7 +2114,7 @@ int op_raw_seek(OggOpusFile *_of,opus_int64 _pos){
 static ogg_int64_t op_get_granulepos(const OggOpusFile *_of,
  ogg_int64_t _pcm_offset,int *_li){
   const OggOpusLink *links;
-  ogg_int64_t        duration;
+  ogg_int64_t        duration=0;
   int                nlinks;
   int                li;
   OP_ASSERT(_pcm_offset>=0);
@@ -2170,7 +2170,7 @@ static int op_pcm_seek_page(OggOpusFile *_of,
   ogg_int64_t        pcm_start;
   ogg_int64_t        pcm_end;
   ogg_int64_t        best_gp;
-  ogg_int64_t        diff;
+  ogg_int64_t        diff=0;
   ogg_uint32_t       serialno;
   opus_int32         pre_skip;
   opus_int64         begin;
@@ -2289,7 +2289,7 @@ static int op_pcm_seek_page(OggOpusFile *_of,
       d2=end-begin>>1;
       if(force_bisect)bisect=begin+(end-begin>>1);
       else{
-        ogg_int64_t diff2;
+        ogg_int64_t diff2=0;
         OP_ALWAYS_TRUE(!op_granpos_diff(&diff,_target_gp,pcm_start));
         OP_ALWAYS_TRUE(!op_granpos_diff(&diff2,pcm_end,pcm_start));
         /*Take a (pretty decent) guess.*/
@@ -2503,7 +2503,7 @@ static ogg_int64_t op_get_pcm_offset(const OggOpusFile *_of,
  ogg_int64_t _gp,int _li){
   const OggOpusLink *links;
   ogg_int64_t        pcm_offset;
-  ogg_int64_t        delta;
+  ogg_int64_t        delta=0;
   int                li;
   links=_of->links;
   pcm_offset=0;
diff --git a/code/qcommon/md4.c b/code/qcommon/md4.c
index b37c87b4..0eb23a50 100644
--- a/code/qcommon/md4.c
+++ b/code/qcommon/md4.c
@@ -177,12 +177,10 @@ static void mdfour_update(struct mdfour *md, byte *in, int n)
 
 static void mdfour_result(struct mdfour *md, byte *out)
 {
-	m = md;
-
-	copy4(out, m->A);
-	copy4(out+4, m->B);
-	copy4(out+8, m->C);
-	copy4(out+12, m->D);
+	copy4(out, md->A);
+	copy4(out+4, md->B);
+	copy4(out+8, md->C);
+	copy4(out+12, md->D);
 }
 
 static void mdfour(byte *out, byte *in, int n)
diff --git a/code/qcommon/msg.c b/code/qcommon/msg.c
index 5623b9bb..397c603e 100644
--- a/code/qcommon/msg.c
+++ b/code/qcommon/msg.c
@@ -246,7 +246,7 @@ int MSG_ReadBits( msg_t *msg, int bits ) {
 		}
 		msg->readcount = (msg->bit>>3)+1;
 	}
-	if ( sgn ) {
+	if ( sgn && bits > 0 && bits < 32 ) {
 		if ( value & ( 1 << ( bits - 1 ) ) ) {
 			value |= -1 ^ ( ( 1 << bits ) - 1 );
 		}
diff --git a/code/qcommon/net_ip.c b/code/qcommon/net_ip.c
index 4ef3e345..98555b99 100644
--- a/code/qcommon/net_ip.c
+++ b/code/qcommon/net_ip.c
@@ -1619,7 +1619,7 @@ Called from NET_Sleep which uses select() to determine which sockets have seen a
 void NET_Event(fd_set *fdr)
 {
 	byte bufData[MAX_MSGLEN + 1];
-	netadr_t from;
+	netadr_t from = {0};
 	msg_t netmsg;
 	
 	while(1)
diff --git a/code/renderergl1/tr_bsp.c b/code/renderergl1/tr_bsp.c
index 64f6a565..ff623ad9 100644
--- a/code/renderergl1/tr_bsp.c
+++ b/code/renderergl1/tr_bsp.c
@@ -927,7 +927,7 @@ int R_StitchPatches( int grid1num, int grid2num ) {
 
 			for (m = 0; m < 2; m++) {
 
-				if ( grid2->width >= MAX_GRID_SIZE )
+				if ( !grid2 || grid2->width >= MAX_GRID_SIZE )
 					break;
 				if (m) offset2 = (grid2->height-1) * grid2->width;
 				else offset2 = 0;
@@ -971,7 +971,7 @@ int R_StitchPatches( int grid1num, int grid2num ) {
 			}
 			for (m = 0; m < 2; m++) {
 
-				if (grid2->height >= MAX_GRID_SIZE)
+				if (!grid2 || grid2->height >= MAX_GRID_SIZE)
 					break;
 				if (m) offset2 = grid2->width-1;
 				else offset2 = 0;
@@ -1026,7 +1026,7 @@ int R_StitchPatches( int grid1num, int grid2num ) {
 		for (k = grid1->height-1; k > 1; k -= 2) {
 			for (m = 0; m < 2; m++) {
 
-				if ( grid2->width >= MAX_GRID_SIZE )
+				if ( !grid2 || grid2->width >= MAX_GRID_SIZE )
 					break;
 				if (m) offset2 = (grid2->height-1) * grid2->width;
 				else offset2 = 0;
diff --git a/code/renderergl1/tr_shader.c b/code/renderergl1/tr_shader.c
index 4e2e6f6c..fb813f2f 100644
--- a/code/renderergl1/tr_shader.c
+++ b/code/renderergl1/tr_shader.c
@@ -2915,7 +2915,7 @@ a single large text block that can be scanned for shader names
 static void ScanAndLoadShaderFiles( void )
 {
 	char **shaderFiles;
-	char *buffers[MAX_SHADER_FILES];
+	char *buffers[MAX_SHADER_FILES] = {0};
 	char *p;
 	int numShaderFiles;
 	int i;
diff --git a/code/sys/sys_unix.c b/code/sys/sys_unix.c
index 2fcb58bd..98e89dd0 100644
--- a/code/sys/sys_unix.c
+++ b/code/sys/sys_unix.c
@@ -719,6 +719,7 @@ dialogResult_t Sys_Dialog( dialogType_t type, const char *message, const char *t
 	qboolean                tried[ NUM_DIALOG_PROGRAMS ] = { qfalse };
 	dialogCommandBuilder_t  commands[ NUM_DIALOG_PROGRAMS ] = { NULL };
 	dialogCommandType_t     preferredCommandType = NONE;
+	int                     i;
 
 	commands[ ZENITY ] = &Sys_ZenityCommand;
 	commands[ KDIALOG ] = &Sys_KdialogCommand;
@@ -730,50 +731,37 @@ dialogResult_t Sys_Dialog( dialogType_t type, const char *message, const char *t
 	else if( !Q_stricmp( session, "kde" ) )
 		preferredCommandType = KDIALOG;
 
-	while( 1 )
+	for( i = NONE + 1; i < NUM_DIALOG_PROGRAMS; i++ )
 	{
-		int i;
+		if( preferredCommandType != NONE && preferredCommandType != i )
+			continue;
 
-		for( i = NONE + 1; i < NUM_DIALOG_PROGRAMS; i++ )
+		if( !tried[ i ] )
 		{
-			if( preferredCommandType != NONE && preferredCommandType != i )
-				continue;
+			int exitCode;
 
-			if( !tried[ i ] )
+			commands[ i ]( type, message, title );
+			exitCode = Sys_Exec( );
+
+			if( exitCode >= 0 )
 			{
-				int exitCode;
-
-				commands[ i ]( type, message, title );
-				exitCode = Sys_Exec( );
-
-				if( exitCode >= 0 )
+				switch( type )
 				{
-					switch( type )
-					{
-						case DT_YES_NO:    return exitCode ? DR_NO : DR_YES;
-						case DT_OK_CANCEL: return exitCode ? DR_CANCEL : DR_OK;
-						default:           return DR_OK;
-					}
-				}
-
-				tried[ i ] = qtrue;
-
-				// The preference failed, so start again in order
-				if( preferredCommandType != NONE )
-				{
-					preferredCommandType = NONE;
-					break;
+					case DT_YES_NO:    return exitCode ? DR_NO : DR_YES;
+					case DT_OK_CANCEL: return exitCode ? DR_CANCEL : DR_OK;
+					default:           return DR_OK;
 				}
 			}
-		}
 
-		for( i = NONE + 1; i < NUM_DIALOG_PROGRAMS; i++ )
-		{
-			if( !tried[ i ] )
-				continue;
-		}
+			tried[ i ] = qtrue;
 
-		break;
+			// The preference failed, so start again in order
+			if( preferredCommandType != NONE )
+			{
+				preferredCommandType = NONE;
+				i = NONE + 1;
+			}
+		}
 	}
 
 	Com_DPrintf( S_COLOR_YELLOW "WARNING: failed to show a dialog\n" );
diff --git a/code/ui/ui_players.c b/code/ui/ui_players.c
index e6355690..614cfb8d 100644
--- a/code/ui/ui_players.c
+++ b/code/ui/ui_players.c
@@ -690,12 +690,12 @@ UI_DrawPlayer
 */
 void UI_DrawPlayer( float x, float y, float w, float h, playerInfo_t *pi, int time ) {
 	refdef_t		refdef;
-	refEntity_t		legs;
-	refEntity_t		torso;
-	refEntity_t		head;
-	refEntity_t		gun;
-	refEntity_t		barrel;
-	refEntity_t		flash;
+	refEntity_t		legs = {0};
+	refEntity_t		torso = {0};
+	refEntity_t		head = {0};
+	refEntity_t		gun = {0};
+	refEntity_t		barrel = {0};
+	refEntity_t		flash = {0};
 	vec3_t			origin;
 	int				renderfx;
 	vec3_t			mins = {-16, -16, -24};
diff --git a/code/ui/ui_shared.c b/code/ui/ui_shared.c
index a7bdd31c..f200202d 100644
--- a/code/ui/ui_shared.c
+++ b/code/ui/ui_shared.c
@@ -417,6 +417,8 @@ qboolean PC_Int_Parse(int handle, int *i) {
 	pc_token_t token;
 	int negative = qfalse;
 
+	if (!i)
+		return qfalse;
 	if (!trap_PC_ReadToken(handle, &token))
 		return qfalse;
 	if (token.string[0] == '-') {
@@ -606,7 +608,7 @@ void Fade(int *flags, float *f, float clamp, int *nextTime, int offsetTime, qboo
 
 void Window_Paint(Window *w, float fadeAmount, float fadeClamp, float fadeCycle) {
   //float bordersize = 0;
-  vec4_t color;
+  vec4_t color = {0};
   rectDef_t fillRect = w->rect;
 
 
@@ -4128,6 +4130,10 @@ menuDef_t *Menus_ActivateByName(const char *p) {
 
 
 void Item_Init(itemDef_t *item) {
+	if (item == NULL) {
+		return;
+	}
+
 	memset(item, 0, sizeof(itemDef_t));
 	item->textscale = 0.55f;
 	Window_Init(&item->window);