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Diffstat (limited to 'source/blender/blendthumb/src/blendthumb_extract.cc')
-rw-r--r-- | source/blender/blendthumb/src/blendthumb_extract.cc | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/source/blender/blendthumb/src/blendthumb_extract.cc b/source/blender/blendthumb/src/blendthumb_extract.cc index de1f50dfdce..163197c8b67 100644 --- a/source/blender/blendthumb/src/blendthumb_extract.cc +++ b/source/blender/blendthumb/src/blendthumb_extract.cc @@ -121,6 +121,9 @@ static eThumbStatus blendthumb_extract_from_file_impl(FileReader *file, while (file_read(file, bhead_data, bhead_size)) { /* Parse type and size from `BHead`. */ const int32_t block_size = bytes_to_native_i32(&bhead_data[4], endian_switch); + if (UNLIKELY(block_size < 0)) { + return BT_INVALID_THUMB; + } /* We're looking for the thumbnail, so skip any other block. */ switch (*((int32_t *)bhead_data)) { @@ -134,7 +137,8 @@ static eThumbStatus blendthumb_extract_from_file_impl(FileReader *file, /* Verify that image dimensions and data size make sense. */ size_t data_size = block_size - 8; - const size_t expected_size = thumb->width * thumb->height * 4; + const uint64_t expected_size = static_cast<uint64_t>(thumb->width) * + static_cast<uint64_t>(thumb->height) * 4; if (thumb->width < 0 || thumb->height < 0 || data_size != expected_size) { return BT_INVALID_THUMB; } |