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glx: Additional paranoia in __glXGetAnswerBuffer / __GLX_GET_ANSWER_BUFFER (v2) [CVE-2014-8093 3/6] 

If the computed reply size is negative, something went wrong, treat it
as an error.

v2: Be more careful about size_t being unsigned (Matthieu Herrb)
v3: SIZE_MAX not SIZE_T_MAX (Alan Coopersmith)

Reviewed-by: Julien Cristau <jcristau@debian.org>
Reviewed-by: Michal Srb <msrb@suse.com>
Reviewed-by: Andy Ritger <aritger@nvidia.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
This commit is contained in:
Adam Jackson 2014-11-10 12:13:38 -05:00 committed by Alan Coopersmith
parent ab2ba9338a
commit 717a1b3776
2 changed files with 8 additions and 2 deletions
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7
glx/indirect_util.c
View File

@ -76,9 +76,14 @@ __glXGetAnswerBuffer(__GLXclientState * cl, size_t required_size,
const unsigned mask = alignment - 1;
if (local_size < required_size) {
const size_t worst_case_size = required_size + alignment;
size_t worst_case_size;
intptr_t temp_buf;
if (required_size < SIZE_MAX - alignment)
worst_case_size = required_size + alignment;
else
return NULL;
if (cl->returnBufSize < worst_case_size) {
void *temp = realloc(cl->returnBuf, worst_case_size);

3
glx/unpack.h
View File

@ -83,7 +83,8 @@ extern xGLXSingleReply __glXReply;
** pointer.
*/
#define __GLX_GET_ANSWER_BUFFER(res,cl,size,align) \
if ((size) > sizeof(answerBuffer)) { \
if (size < 0) return BadLength; \
else if ((size) > sizeof(answerBuffer)) { \
int bump; \
if ((cl)->returnBufSize < (size)+(align)) { \
(cl)->returnBuf = (GLbyte*)realloc((cl)->returnBuf, \