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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> |
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| .. | ||
| deflate.c | ||
| deflate_syms.c | ||
| deftree.c | ||
| defutil.h | ||
| Makefile | ||