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Add some validation for gfx.wad.

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Shpoike 2020-02-29 02:12:10 +00:00
parent 4315b1cfdc
commit 1cda0611c8
4 changed files with 26 additions and 28 deletions
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18
Quake/gl_draw.c
View file

@ -221,6 +221,7 @@ qpic_t *Draw_PicFromWad (const char *name)
qpic_t *p;
glpic_t gl;
src_offset_t offset; //johnfitz
lumpinfo_t *info;
//Spike -- added cachepic stuff here, to avoid glitches if the function is called multiple times with the same image.
for (pic=menu_cachepics, i=0 ; i<menu_numcachepics ; pic++, i++)
@ -231,8 +232,14 @@ qpic_t *Draw_PicFromWad (const char *name)
if (menu_numcachepics == MAX_CACHED_PICS)
Sys_Error ("menu_numcachepics == MAX_CACHED_PICS");
p = (qpic_t *) W_GetLumpName (name);
if (!p) return pic_nul; //johnfitz
p = (qpic_t *) W_GetLumpName (name, &info);
if (!p)
{
Con_SafePrintf ("W_GetLumpName: %s not found\n", name);
return pic_nul; //johnfitz
}
if (info->size < sizeof(int)*2 || 8+p->width*p->height < info->size) Sys_Error ("Draw_PicFromWad: pic \"%s\" truncated", name);
if (info->type != TYP_QPIC) Sys_Error ("Draw_PicFromWad: lump \"%s\" is not a qpic", name);
// load little ones into the scrap
if (p->width < 64 && p->height < 64)
@ -408,9 +415,12 @@ void Draw_LoadPics (void)
{
byte *data;
src_offset_t offset;
lumpinfo_t *info;
data = (byte *) W_GetLumpName ("conchars");
if (!data) Sys_Error ("Draw_LoadPics: couldn't load conchars");
data = (byte *) W_GetLumpName ("conchars", &info);
if (!data || info->size < 128*128) Sys_Error ("Draw_LoadPics: couldn't load conchars");
if (info->size != 128*128) Con_Warning("Invalid size for gfx.wad conchars lump - attempting to ignore for compat.\n");
else if (info->type != TYP_MIPTEX) Con_DWarning("Invalid type for gfx.wad conchars lump - attempting to ignore for compat.\n"); //not really a miptex, but certainly NOT a qpic.
offset = (src_offset_t)data - (src_offset_t)wad_base;
char_texture = TexMgr_LoadImage (NULL, WADFILENAME":conchars", 128, 128, SRC_INDEXED, data,
WADFILENAME, offset, (premul_hud?TEXPREF_PREMULTIPLY:0)|TEXPREF_ALPHA | TEXPREF_NEAREST | TEXPREF_NOPICMIP | TEXPREF_CONCHARS);

3
Quake/sbar.c
View file

@ -116,9 +116,10 @@ qpic_t *Sbar_CheckPicFromWad (const char *name)
{
extern qpic_t *pic_nul;
qpic_t *r;
lumpinfo_t *info;
if (!hudtype)
return pic_nul; //one already failed, don't waste cpu
if (!W_GetLumpinfo(name))
if (!W_GetLumpName(name, &info))
r = pic_nul;
else
r = Draw_PicFromWad(name);

28
Quake/wad.c
View file

@ -40,7 +40,7 @@ Space padding is so names can be printed nicely in tables.
Can safely be performed in place.
==================
*/
void W_CleanupName (const char *in, char *out)
static void W_CleanupName (const char *in, char *out)
{
int i;
int c;
@ -94,12 +94,16 @@ void W_LoadWadFile (void) //johnfitz -- filename is now hard-coded for honesty
wad_numlumps = LittleLong(header->numlumps);
infotableofs = LittleLong(header->infotableofs);
wad_lumps = (lumpinfo_t *)(wad_base + infotableofs);
if (infotableofs < 0 || infotableofs+wad_numlumps*sizeof(lumpinfo_t)>com_filesize)
Sys_Error ("Wad file %s header extends beyond end of file\n",filename);
for (i=0, lump_p = wad_lumps ; i<wad_numlumps ; i++,lump_p++)
{
lump_p->filepos = LittleLong(lump_p->filepos);
lump_p->size = LittleLong(lump_p->size);
W_CleanupName (lump_p->name, lump_p->name); // CAUTION: in-place editing!!!
if (lump_p->filepos < 0 || lump_p->size < 0 || lump_p->filepos + lump_p->size > com_filesize)
Sys_Error ("Wad file %s lump \"%16s\" extends beyond end of file\n",filename, lump_p->name);
W_CleanupName (lump_p->name, lump_p->name); // CAUTION: in-place editing!!! The endian fixups too.
if (lump_p->type == TYP_QPIC)
SwapPic ( (qpic_t *)(wad_base + lump_p->filepos));
}
@ -111,7 +115,7 @@ void W_LoadWadFile (void) //johnfitz -- filename is now hard-coded for honesty
W_GetLumpinfo
=============
*/
lumpinfo_t *W_GetLumpinfo (const char *name)
static lumpinfo_t *W_GetLumpinfo (const char *name)
{
int i;
lumpinfo_t *lump_p;
@ -128,30 +132,16 @@ lumpinfo_t *W_GetLumpinfo (const char *name)
return NULL;
}
void *W_GetLumpName (const char *name)
void *W_GetLumpName (const char *name, lumpinfo_t **out_info) //Spike: so caller can verify that the qpic was written properly.
{
lumpinfo_t *lump;
lump = W_GetLumpinfo (name);
if (!lump)
{
Con_SafePrintf ("W_GetLumpName: %s not found\n", name); //johnfitz -- was Sys_Error
return NULL; //johnfitz
}
return (void *)(wad_base + lump->filepos);
}
void *W_GetLumpNum (int num)
{
lumpinfo_t *lump;
if (num < 0 || num > wad_numlumps)
Sys_Error ("W_GetLumpNum: bad number: %i", num);
lump = wad_lumps + num;
*out_info = lump;
return (void *)(wad_base + lump->filepos);
}

5
Quake/wad.h
View file

@ -71,10 +71,7 @@ extern lumpinfo_t *wad_lumps;
extern byte *wad_base;
void W_LoadWadFile (void); //johnfitz -- filename is now hard-coded for honesty
void W_CleanupName (const char *in, char *out);
lumpinfo_t *W_GetLumpinfo (const char *name);
void *W_GetLumpName (const char *name);
void *W_GetLumpNum (int num);
void *W_GetLumpName (const char *name, lumpinfo_t **out_info);
void SwapPic (qpic_t *pic);