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authorTom Sepez <tsepez@chromium.org>2018-10-22 17:23:51 +0000
committerChromium commit bot <commit-bot@chromium.org>2018-10-22 17:23:51 +0000
commit8298d25cf3ac41d71a8533700d929cadac1c360d (patch)
tree219955226276efd61fd9e67d0f56d45a453c5743 /core/fxcodec
parentaf3d6cc8910fbddc7518f9d54f4c4ad0dd25ed40 (diff)
downloadpdfium-8298d25cf3ac41d71a8533700d929cadac1c360d.tar.xz
Speculative fix for bad FX_Free() under fuzzer.
A recent change to CFX_CodecMemory prevented it leaking an old buffer when a realloc() failed. But there is a corner case where realloc() to size 0 also returns null (as would a failed alloc), but frees the buffer, rather than leaving it intact. TBR: thestig@chromium.org Bug: 897585 Change-Id: Ib1e82088a822008780f11c6ea94b0552fbf51146 Reviewed-on: https://pdfium-review.googlesource.com/c/44451 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Tom Sepez <tsepez@chromium.org>
Diffstat (limited to 'core/fxcodec')
-rw-r--r--core/fxcodec/codec/cfx_codec_memory.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/core/fxcodec/codec/cfx_codec_memory.cpp b/core/fxcodec/codec/cfx_codec_memory.cpp
index 640db12415..36b78672c6 100644
--- a/core/fxcodec/codec/cfx_codec_memory.cpp
+++ b/core/fxcodec/codec/cfx_codec_memory.cpp
@@ -32,7 +32,7 @@ size_t CFX_CodecMemory::ReadBlock(void* buffer, size_t size) {
bool CFX_CodecMemory::TryResize(size_t new_buffer_size) {
uint8_t* pOldBuf = buffer_.release();
uint8_t* pNewBuf = FX_TryRealloc(uint8_t, pOldBuf, new_buffer_size);
- if (!pNewBuf) {
+ if (new_buffer_size && !pNewBuf) {
buffer_.reset(pOldBuf);
return false;
}