diff options
| author | Adam Jackson <ajax@redhat.com> | 2014-11-10 12:13:37 -0500 |
|---|---|---|
| committer | Alan Coopersmith <alan.coopersmith@oracle.com> | 2014-12-08 18:09:49 -0800 |
| commit | ab2ba9338aa5e85b4487bc7fbe69985c76483e01 (patch) | |
| tree | 90afba69ff825934c8b2a9f32aae914dec9ffea9 /glx/singlepixswap.c | |
| parent | 23fe7718bb171e71db2d1a30505c2ca2988799d9 (diff) | |
glx: Be more strict about rejecting invalid image sizes [CVE-2014-8093 2/6]
Before this we'd just clamp the image size to 0, which was just
hideously stupid; if the parameters were such that they'd overflow an
integer, you'd allocate a small buffer, then pass huge values into (say)
ReadPixels, and now you're scribbling over arbitrary server memory.
Reviewed-by: Keith Packard <keithp@keithp.com>
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>
Diffstat (limited to 'glx/singlepixswap.c')
| -rw-r--r-- | glx/singlepixswap.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/glx/singlepixswap.c b/glx/singlepixswap.c index 846910153..8dc304fa7 100644 --- a/glx/singlepixswap.c +++ b/glx/singlepixswap.c @@ -75,7 +75,7 @@ __glXDispSwap_ReadPixels(__GLXclientState * cl, GLbyte * pc) lsbFirst = *(GLboolean *) (pc + 25); compsize = __glReadPixels_size(format, type, width, height); if (compsize < 0) - compsize = 0; + return BadLength; glPixelStorei(GL_PACK_SWAP_BYTES, !swapBytes); glPixelStorei(GL_PACK_LSB_FIRST, lsbFirst); @@ -144,7 +144,7 @@ __glXDispSwap_GetTexImage(__GLXclientState * cl, GLbyte * pc) compsize = __glGetTexImage_size(target, level, format, type, width, height, depth); if (compsize < 0) - compsize = 0; + return BadLength; glPixelStorei(GL_PACK_SWAP_BYTES, !swapBytes); __GLX_GET_ANSWER_BUFFER(answer, cl, compsize, 1); @@ -252,9 +252,9 @@ GetSeparableFilter(__GLXclientState * cl, GLbyte * pc, GLXContextTag tag) compsize2 = __glGetTexImage_size(target, 1, format, type, height, 1, 1); if (compsize < 0) - compsize = 0; + return BadLength; if (compsize2 < 0) - compsize2 = 0; + return BadLength; compsize = __GLX_PAD(compsize); compsize2 = __GLX_PAD(compsize2); @@ -338,7 +338,7 @@ GetConvolutionFilter(__GLXclientState * cl, GLbyte * pc, GLXContextTag tag) */ compsize = __glGetTexImage_size(target, 1, format, type, width, height, 1); if (compsize < 0) - compsize = 0; + return BadLength; glPixelStorei(GL_PACK_SWAP_BYTES, !swapBytes); __GLX_GET_ANSWER_BUFFER(answer, cl, compsize, 1); @@ -415,7 +415,7 @@ GetHistogram(__GLXclientState * cl, GLbyte * pc, GLXContextTag tag) */ compsize = __glGetTexImage_size(target, 1, format, type, width, 1, 1); if (compsize < 0) - compsize = 0; + return BadLength; glPixelStorei(GL_PACK_SWAP_BYTES, !swapBytes); __GLX_GET_ANSWER_BUFFER(answer, cl, compsize, 1); @@ -483,7 +483,7 @@ GetMinmax(__GLXclientState * cl, GLbyte * pc, GLXContextTag tag) compsize = __glGetTexImage_size(target, 1, format, type, 2, 1, 1); if (compsize < 0) - compsize = 0; + return BadLength; glPixelStorei(GL_PACK_SWAP_BYTES, !swapBytes); __GLX_GET_ANSWER_BUFFER(answer, cl, compsize, 1); @@ -554,7 +554,7 @@ GetColorTable(__GLXclientState * cl, GLbyte * pc, GLXContextTag tag) */ compsize = __glGetTexImage_size(target, 1, format, type, width, 1, 1); if (compsize < 0) - compsize = 0; + return BadLength; glPixelStorei(GL_PACK_SWAP_BYTES, !swapBytes); __GLX_GET_ANSWER_BUFFER(answer, cl, compsize, 1); |