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authorJulien Cristau <jcristau@debian.org>2014-11-10 12:13:41 -0500
committerMike Gabriel <mike.gabriel@das-netzwerkteam.de>2015-02-14 16:14:32 +0100
commit78b38a8a37e6105360c82a710ef62c92643ea4c1 (patch)
treecd34e2d29062e55f64abca90b076a8a9146ba0ad /nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c
parent1a9f23118787be611b6db51e4eac864c43c702d9 (diff)
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glx: Length checking for GLXRender requests (v2) [CVE-2014-8098 2/8] (v3)
v2: Remove can't-happen comparison for cmdlen < 0 (Michal Srb) v3: backport to RHEL5 hit old paths v4: backport to nx-libs 3.6.x (Mike DePaulo) Reviewed-by: Adam Jackson <ajax@redhat.com> Reviewed-by: Michal Srb <msrb@suse.com> Reviewed-by: Andy Ritger <aritger@nvidia.com> Signed-off-by: Julien Cristau <jcristau@debian.org> Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com> Signed-off-by: Fedora X Ninjas <x@fedoraproject.org> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c')
-rw-r--r--nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c20
1 files changed, 10 insertions, 10 deletions
diff --git a/nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c b/nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c
index 027cba709..7174fdaec 100644
--- a/nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c
+++ b/nx-X11/programs/Xserver/GL/glx/glxcmdsswap.c
@@ -498,7 +498,7 @@ int __glXSwapRender(__GLXclientState *cl, GLbyte *pc)
left = (req->length << 2) - sz_xGLXRenderReq;
while (left > 0) {
__GLXrenderSizeData *entry;
- int extra;
+ int extra = 0;
void (* proc)(GLbyte *);
/*
@@ -511,6 +511,9 @@ int __glXSwapRender(__GLXclientState *cl, GLbyte *pc)
cmdlen = hdr->length;
opcode = hdr->opcode;
+ if (left < cmdlen)
+ return BadLength;
+
if ( (opcode >= __GLX_MIN_RENDER_OPCODE) &&
(opcode <= __GLX_MAX_RENDER_OPCODE) ) {
entry = &__glXRenderSizeTable[opcode];
@@ -531,22 +534,19 @@ int __glXSwapRender(__GLXclientState *cl, GLbyte *pc)
client->errorValue = commandsDone;
return __glXBadRenderRequest;
}
+
+ if (cmdlen < entry->bytes) {
+ return BadLength;
+ }
+
if (entry->varsize) {
/* variable size command */
extra = (*entry->varsize)(pc + __GLX_RENDER_HDR_SIZE, True);
if (extra < 0) {
return BadLength;
}
- if (cmdlen != __GLX_PAD(entry->bytes + extra)) {
- return BadLength;
- }
- } else {
- /* constant size command */
- if (cmdlen != __GLX_PAD(entry->bytes)) {
- return BadLength;
- }
}
- if (left < cmdlen) {
+ if (cmdlen != safe_pad(safe_add(entry->bytes, extra))) {
return BadLength;
}