diff options
author | commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2013-11-05 15:46:56 +0000 |
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committer | commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2013-11-05 15:46:56 +0000 |
commit | 4faa869cdabbdcf4867118b4a1272296baaeeb52 (patch) | |
tree | 98283bc90add39d00d98ac4dfde9af051816637a /src/core/SkRegion.cpp | |
parent | fedf13d73a6d6f1921ce5f449bb6e34e9d8e14e4 (diff) |
Checking structure sizes before reading them from memory to avoid overflowing the buffer's stream.
BUG=
R=reed@google.com, mtklein@google.com, senorblanco@chromium.org
Committed: https://code.google.com/p/skia/source/detail?r=12114
Committed: https://code.google.com/p/skia/source/detail?r=12119
Author: sugoi@chromium.org
Review URL: https://codereview.chromium.org/41253002
git-svn-id: http://skia.googlecode.com/svn/trunk@12130 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'src/core/SkRegion.cpp')
-rw-r--r-- | src/core/SkRegion.cpp | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/src/core/SkRegion.cpp b/src/core/SkRegion.cpp index 02994bffb0..59af1c2f7a 100644 --- a/src/core/SkRegion.cpp +++ b/src/core/SkRegion.cpp @@ -1100,9 +1100,9 @@ bool SkRegion::op(const SkRegion& rgna, const SkRegion& rgnb, Op op) { #include "SkBuffer.h" -uint32_t SkRegion::writeToMemory(void* storage) const { +size_t SkRegion::writeToMemory(void* storage) const { if (NULL == storage) { - uint32_t size = sizeof(int32_t); // -1 (empty), 0 (rect), runCount + size_t size = sizeof(int32_t); // -1 (empty), 0 (rect), runCount if (!this->isEmpty()) { size += sizeof(fBounds); if (this->isComplex()) { @@ -1133,11 +1133,11 @@ uint32_t SkRegion::writeToMemory(void* storage) const { return buffer.pos(); } -uint32_t SkRegion::readFromMemory(const void* storage) { - SkRBuffer buffer(storage); - SkRegion tmp; - int32_t count; - +size_t SkRegion::readFromMemory(const void* storage, size_t length) { + SkRBufferWithSizeCheck buffer(storage, length); + SkRegion tmp; + int32_t count; + count = buffer.readS32(); if (count >= 0) { buffer.read(&tmp.fBounds, sizeof(tmp.fBounds)); @@ -1146,12 +1146,18 @@ uint32_t SkRegion::readFromMemory(const void* storage) { } else { int32_t ySpanCount = buffer.readS32(); int32_t intervalCount = buffer.readS32(); - tmp.allocateRuns(count, ySpanCount, intervalCount); - buffer.read(tmp.fRunHead->writable_runs(), count * sizeof(RunType)); + if (buffer.isValid()) { + tmp.allocateRuns(count, ySpanCount, intervalCount); + buffer.read(tmp.fRunHead->writable_runs(), count * sizeof(RunType)); + } } } - this->swap(tmp); - return buffer.pos(); + size_t sizeRead = 0; + if (buffer.isValid()) { + this->swap(tmp); + sizeRead = buffer.pos(); + } + return sizeRead; } /////////////////////////////////////////////////////////////////////////////// |