Mikhail Zaslonko 1c0a0af511 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: 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>		2023-02-27 17:00:14 -08:00
..
deflate.c	lib/zlib: Split deflate and inflate states for DFLTCC	2023-02-02 22:50:09 -08:00
deflate_syms.c	lib/zlib: add zlib_deflate_dfltcc_enabled() function	2020-01-31 10:30:40 -08:00
deftree.c	lib/zlib: add s390 hardware support for kernel zlib_deflate	2020-01-31 10:30:40 -08:00
defutil.h	lib/zlib: DFLTCC deflate does not write all available bits for Z_NO_FLUSH	2023-02-27 17:00:14 -08:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00