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do some sanity checking on the header lumps in case of truncated file

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This commit is contained in:
Bill Currie 2004-02-29 04:24:42 +00:00
parent 0c133699d0
commit beb22957db
1 changed files with 13 additions and 8 deletions
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21
libs/models/brush/model_brush.c
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@ -47,6 +47,7 @@ static __attribute__ ((unused)) const char rcsid[] =
#include "QF/cvar.h"
#include "QF/model.h"
#include "QF/qendian.h"
#include "QF/quakefs.h"
#include "QF/render.h"
#include "QF/sys.h"
@ -823,17 +824,21 @@ Mod_LoadBrushModel (model_t *mod, void *buffer)
mod->checksum2 = 0;
for (i = 0; i < HEADER_LUMPS; i++) {
lump_t *lump = header->lumps + i;
int csum;
if (lump->fileofs > qfs_filesize
|| (lump->fileofs + lump->filelen) > qfs_filesize)
Sys_Error ("Mod_LoadBrushModel: %s seems to be truncated",
mod->name);
if (i == LUMP_ENTITIES)
continue;
mod->checksum ^= LittleLong (Com_BlockChecksum
(mod_base + header->lumps[i].fileofs,
header->lumps[i].filelen));
csum = Com_BlockChecksum (mod_base + lump->fileofs, lump->filelen);
csum = LittleLong (csum);
mod->checksum ^= csum;
if (i == LUMP_VISIBILITY || i == LUMP_LEAFS || i == LUMP_NODES)
continue;
mod->checksum2 ^= LittleLong (Com_BlockChecksum
(mod_base + header->lumps[i].fileofs,
header->lumps[i].filelen));
if (i != LUMP_VISIBILITY && i != LUMP_LEAFS && i != LUMP_NODES)
mod->checksum2 ^= csum;
}
// load into heap