diff options
| author | Adam Jackson <ajax@redhat.com> | 2014-11-10 12:13:38 -0500 |
|---|---|---|
| committer | Alan Coopersmith <alan.coopersmith@oracle.com> | 2014-12-08 18:09:49 -0800 |
| commit | 717a1b37767b41e14859e5022ae9e679152821a9 (patch) | |
| tree | 0eecf4560511efcd4d75d8c5969060a1bc656b99 | |
| parent | ab2ba9338aa5e85b4487bc7fbe69985c76483e01 (diff) | |
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>
| -rw-r--r-- | glx/indirect_util.c | 7 | ||||
| -rw-r--r-- | glx/unpack.h | 3 |
2 files changed, 8 insertions, 2 deletions
diff --git a/glx/indirect_util.c b/glx/indirect_util.c index 926e57c78..de8149127 100644 --- a/glx/indirect_util.c +++ b/glx/indirect_util.c @@ -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); diff --git a/glx/unpack.h b/glx/unpack.h index 52fba74e1..2b1ebcf02 100644 --- a/glx/unpack.h +++ b/glx/unpack.h @@ -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, \ |