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06de62c Detect multiplication overflow when computing sector position

46a8443 Limit the number of elements in a vector (found by oss-fuzz)
This commit is contained in:
delphij 2019-11-17 20:56:25 +00:00
parent b0143cf9df
commit b6b85fd647
2 changed files with 21 additions and 7 deletions
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27
src/cdf.c
View File

@ -35,7 +35,7 @@
#include "file.h"
#ifndef lint
FILE_RCSID("@(#)$File: cdf.c,v 1.114 2019/02/20 02:35:27 christos Exp $")
FILE_RCSID("@(#)$File: cdf.c,v 1.116 2019/08/26 14:31:39 christos Exp $")
#endif
#include <assert.h>
@ -53,6 +53,10 @@ FILE_RCSID("@(#)$File: cdf.c,v 1.114 2019/02/20 02:35:27 christos Exp $")
#define EFTYPE EINVAL
#endif
#ifndef SIZE_T_MAX
#define SIZE_T_MAX CAST(size_t, ~0ULL)
#endif
#include "cdf.h"
#ifdef CDF_DEBUG
@ -405,7 +409,12 @@ cdf_read_sector(const cdf_info_t *info, void *buf, size_t offs, size_t len,
const cdf_header_t *h, cdf_secid_t id)
{
size_t ss = CDF_SEC_SIZE(h);
size_t pos = CDF_SEC_POS(h, id);
size_t pos;
if (SIZE_T_MAX / ss < CAST(size_t, id))
return -1;
pos = CDF_SEC_POS(h, id);
assert(ss == len);
return cdf_read(info, CAST(off_t, pos), RCAST(char *, buf) + offs, len);
}
@ -415,7 +424,12 @@ cdf_read_short_sector(const cdf_stream_t *sst, void *buf, size_t offs,
size_t len, const cdf_header_t *h, cdf_secid_t id)
{
size_t ss = CDF_SHORT_SEC_SIZE(h);
size_t pos = CDF_SHORT_SEC_POS(h, id);
size_t pos;
if (SIZE_T_MAX / ss < CAST(size_t, id))
return -1;
pos = CDF_SHORT_SEC_POS(h, id);
assert(ss == len);
if (pos + len > CDF_SEC_SIZE(h) * sst->sst_len) {
DPRINTF(("Out of bounds read %" SIZE_T_FORMAT "u > %"
@ -1013,8 +1027,9 @@ cdf_read_property_info(const cdf_stream_t *sst, const cdf_header_t *h,
goto out;
}
nelements = CDF_GETUINT32(q, 1);
if (nelements == 0) {
DPRINTF(("CDF_VECTOR with nelements == 0\n"));
if (nelements > CDF_ELEMENT_LIMIT || nelements == 0) {
DPRINTF(("CDF_VECTOR with nelements == %"
SIZE_T_FORMAT "u\n", nelements));
goto out;
}
slen = 2;
@ -1056,8 +1071,6 @@ cdf_read_property_info(const cdf_stream_t *sst, const cdf_header_t *h,
goto out;
inp += nelem;
}
DPRINTF(("nelements = %" SIZE_T_FORMAT "u\n",
nelements));
for (j = 0; j < nelements && i < sh.sh_properties;
j++, i++)
{

1
src/cdf.h
View File

@ -48,6 +48,7 @@
typedef int32_t cdf_secid_t;
#define CDF_LOOP_LIMIT 10000
#define CDF_ELEMENT_LIMIT 100000
#define CDF_SECID_NULL 0
#define CDF_SECID_FREE -1