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| author | Bo Xu <bo_xu@foxitsoftware.com> | 2014-08-15 12:24:45 -0700 |
|---|---|---|
| committer | Bo Xu <bo_xu@foxitsoftware.com> | 2014-08-15 12:24:45 -0700 |
| commit | d726307fa4384f8dcb23a6498dde5a78436322ec (patch) | |
| tree | 58493118803f3475281900587f5dd6fba8b119aa /core/src/fxcodec/codec | |
| parent | 368ed462dd6e5e63977ca2b2e56a7e83b3a3bdda (diff) | |
| download | pdfium-d726307fa4384f8dcb23a6498dde5a78436322ec.tar.xz | |
Fix buffer size offset error in PNG_Predictor
BUG=393602
R=tsepez@chromium.org
Review URL: https://codereview.chromium.org/466153005
Diffstat (limited to 'core/src/fxcodec/codec')
| -rw-r--r-- | core/src/fxcodec/codec/fx_codec_flate.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/core/src/fxcodec/codec/fx_codec_flate.cpp b/core/src/fxcodec/codec/fx_codec_flate.cpp index c02f0977cf..a12fffbe5c 100644 --- a/core/src/fxcodec/codec/fx_codec_flate.cpp +++ b/core/src/fxcodec/codec/fx_codec_flate.cpp @@ -398,6 +398,7 @@ static void PNG_Predictor(FX_LPBYTE& data_buf, FX_DWORD& data_size, FX_LPBYTE pDestData = dest_buf; for (int row = 0; row < row_count; row ++) { FX_BYTE tag = pSrcData[0]; + byte_cnt++; if (tag == 0) { int move_size = row_size; if ((row + 1) * (move_size + 1) > (int)data_size) { @@ -406,7 +407,7 @@ static void PNG_Predictor(FX_LPBYTE& data_buf, FX_DWORD& data_size, FXSYS_memmove32(pDestData, pSrcData + 1, move_size); pSrcData += move_size + 1; pDestData += move_size; - byte_cnt += move_size + 1; + byte_cnt += move_size; continue; } for (int byte = 0; byte < row_size && byte_cnt < (int)data_size; byte ++) { @@ -464,7 +465,6 @@ static void PNG_Predictor(FX_LPBYTE& data_buf, FX_DWORD& data_size, } pSrcData += row_size + 1; pDestData += row_size; - byte_cnt++; } FX_Free(data_buf); data_buf = dest_buf; |