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ED_ParseEpair: don't read garbage into vectors if the string is too short 

This is a bug from vanilla.
Shows up in qump_vingal.bsp from QUMP, which has func_illusionary
entities with "origin" "". Example are the torch holders before
the first door in the map.
Prior to this commit the vector would possibly get a garbage value,
depending on what was on the stack.

see: http://celephais.net/board/view_thread.php?id=61523&start=53&end=61

git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@1527 af15c1b1-3010-417e-b628-4374ebc0bcbd
This commit is contained in:
Eric Wasylishen 2017-11-07 21:49:32 +00:00
parent bbcdd9cbac
commit 78970b5323
1 changed files with 15 additions and 2 deletions
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17
Quake/pr_edict.c
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@ -777,6 +777,7 @@ static qboolean ED_ParseEpair (void *base, ddef_t *key, const char *s)
char string[128];
ddef_t *def;
char *v, *w;
char *end;
void *d;
dfunction_t *func;
@ -793,17 +794,29 @@ static qboolean ED_ParseEpair (void *base, ddef_t *key, const char *s)
break;
case ev_vector:
strcpy (string, s);
q_strlcpy(string, s, sizeof(string));
end = (char *)string + strlen(string);
v = string;
w = string;
for (i = 0; i < 3; i++)
for (i = 0; i < 3 && (w <= end); i++) // ericw -- added (w <= end) check
{
// set `v` to the next space (or 0 byte), and change that char to a 0 byte
while (*v && *v != ' ')
v++;
*v = 0;
((float *)d)[i] = atof (w);
w = v = v+1;
}
// ericw -- fill remaining elements to 0.0f in case we hit the end of string before reading 3 floats
if (i < 3)
{
if (developer.value)
Con_DWarning("vanilla will read garbage for \"%s\" \"%s\"\n", PR_GetString(key->s_name), s);
for (; i < 3; i++)
((float *)d)[i] = 0.0f;
}
break;
case ev_entity: