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author | Mikhail Zaslonko <zaslonko@linux.ibm.com> | 2023-02-21 16:16:17 +0300 |
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committer | Andrew Morton <akpm@linux-foundation.org> | 2023-02-28 04:00:14 +0300 |
commit | 1c0a0af511effbd75beffa6c5e54fd64d3563860 (patch) | |
tree | 20d214538385d9ff2e48acc748b963af3b6c1227 /mm | |
parent | 3f98c9a62c338bbe06a215c9491e6166ea39bf82 (diff) | |
download | linux-1c0a0af511effbd75beffa6c5e54fd64d3563860.tar.xz |
lib/zlib: DFLTCC deflate does not write all available bits for Z_NO_FLUSH
DFLTCC deflate with Z_NO_FLUSH might generate a corrupted stream when the
output buffer is not large enough to fit all the deflate output at once.
The problem takes place on closing the deflate block since flush_pending()
might leave some output bits not written. Similar problem for software
deflate with Z_BLOCK flush option (not supported by kernel zlib deflate)
has been fixed a while ago in userspace zlib but the fix never got to the
kernel.
Now flush_pending() flushes the bit buffer before copying out the byte
buffer, in order to really flush as much as possible.
Currently there are no users of DFLTCC deflate with Z_NO_FLUSH option in
the kernel so the problem remained hidden for a while.
This commit is based on the old zlib commit:
https://github.com/madler/zlib/commit/0b828b4
Link: https://lkml.kernel.org/r/20230221131617.3369978-2-zaslonko@linux.ibm.com
Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions