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author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2021-12-26 09:16:41 +0000 |
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committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2021-12-26 09:16:41 +0000 |
commit | e15e137ba527ba97c82149ad8c6bed59088d8616 (patch) | |
tree | d97d0742d8fa448232faad05a7b40ccc18641b68 /lib | |
parent | 2d31b9e0a06dde404131dbc2300502bfd2698819 (diff) | |
download | netpbm-mirror-e15e137ba527ba97c82149ad8c6bed59088d8616.tar.gz netpbm-mirror-e15e137ba527ba97c82149ad8c6bed59088d8616.tar.xz netpbm-mirror-e15e137ba527ba97c82149ad8c6bed59088d8616.zip |
Release 10.73.38
git-svn-id: http://svn.code.sf.net/p/netpbm/code/super_stable@4219 9d0c8265-081b-0410-96cb-a4ca84ce46f8
Diffstat (limited to 'lib')
-rw-r--r-- | lib/libpbm2.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/libpbm2.c b/lib/libpbm2.c index f199c51a..8fde27fd 100644 --- a/lib/libpbm2.c +++ b/lib/libpbm2.c @@ -216,6 +216,9 @@ pbm_readpbmrow_bitoffset(FILE * const ifP, Read it into packedBits[], preserving surrounding image data. Logic not tested for negative offsets. + + Because we are reading in packed mode large cols and offset values are + acceptable; dividing by 8 prevents overflows. -----------------------------------------------------------------------------*/ unsigned int const rsh = offset % 8; unsigned int const lsh = (8 - rsh) % 8; @@ -224,13 +227,15 @@ pbm_readpbmrow_bitoffset(FILE * const ifP, Aligned to nearest byte boundary to the left, so the first few bits might contain original data, not output. */ - unsigned int const last = pbm_packed_bytes(cols+rsh) - 1; + unsigned int const last = pbm_packed_bytes((unsigned int)cols + rsh) - 1; /* Position within window of rightmost byte after shift */ /* The original leftmost and rightmost chars. */ unsigned char const origHead = window[0]; unsigned char const origEnd = window[last]; + assert(cols > 0 && pbm_packed_bytes(cols) > 0); + pbm_readpbmrow_packed(ifP, window, cols, format); if (rsh > 0) { |