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Don't crash on invalid input in the Microsoft Wave reader. /bigfoot

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git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@2949 fc73d0e0-1445-4013-8a0c-d673dee63da5
This commit is contained in:
Molgrum 2008-05-01 11:59:22 +00:00
parent 5852614cf5
commit 9bda9e9fc1
1 changed files with 9 additions and 4 deletions
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13
engine/client/snd_mem.c
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@ -933,17 +933,22 @@ int GetLittleLong(void)
void FindNextChunk(char *name) void FindNextChunk(char *name)
{ {
unsigned int dataleft;
while (1) while (1)
{ {
data_p=last_chunk; dataleft = iff_end - last_chunk;
data_p += 4; if (dataleft < 8)
if (data_p >= iff_end)
{ // didn't find the chunk { // didn't find the chunk
data_p = NULL; data_p = NULL;
return; return;
} }
data_p=last_chunk;
data_p += 4;
dataleft-= 8;
iff_chunk_len = GetLittleLong(); iff_chunk_len = GetLittleLong();
if (iff_chunk_len < 0) if (iff_chunk_len < 0 || iff_chunk_len > dataleft)
{ {
data_p = NULL; data_p = NULL;
return; return;