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| author | Ryan Harrison <rharrison@chromium.org> | 2017-09-22 10:53:34 -0400 |
|---|---|---|
| committer | Chromium commit bot <commit-bot@chromium.org> | 2017-09-22 15:03:06 +0000 |
| commit | 73bed4ef57444a2ea066d532a8a82b230fd206d9 (patch) | |
| tree | 05b9a588ea3daa1e4ef997d47c9d9a0d200019ff /core/fxcodec/codec/ccodec_gifmodule.cpp | |
| parent | 0150a5455829ede62017bc24ed9c4bcdc1cafef2 (diff) | |
| download | pdfium-73bed4ef57444a2ea066d532a8a82b230fd206d9.tar.xz | |
Fix crash when rendering invalid GIF
The core fix in this CL is a change to how LWZ decompression works, so
that when the min code table size and the color palette size are
different, color codes after the end of the defined color palette are
considered errors.
This CL also introduces a bunch of tweaks to the call return path,
since there were multiple locations where the GIF decode failing
status was being dropped on the floor, so the end widget would have a
bitmap with the default colour in it, instead of nothing.
BUG=chromium:616671
Change-Id: Id6f40d552dc24650c91e9903f710ff2fa63bc774
Reviewed-on: https://pdfium-review.googlesource.com/14630
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>
Diffstat (limited to 'core/fxcodec/codec/ccodec_gifmodule.cpp')
| -rw-r--r-- | core/fxcodec/codec/ccodec_gifmodule.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/core/fxcodec/codec/ccodec_gifmodule.cpp b/core/fxcodec/codec/ccodec_gifmodule.cpp index f7e3546a8f..911323c3a1 100644 --- a/core/fxcodec/codec/ccodec_gifmodule.cpp +++ b/core/fxcodec/codec/ccodec_gifmodule.cpp @@ -36,7 +36,7 @@ GifDecodeStatus CCodec_GifModule::ReadHeader(Context* pContext, *width = context->width; *height = context->height; - *pal_num = context->global_pal_num; + *pal_num = (2 << context->global_pal_exp); *pal_pp = context->m_GlobalPalette.empty() ? nullptr : context->m_GlobalPalette.data(); *bg_index = context->bc_index; |