Guo Xuenan 9fb8bc6cfc lz4: fix LZ4_decompress_safe_partial read out of bound ... commit eafc0a0239 upstream. When partialDecoding, it is EOF if we've either filled the output buffer or can't proceed with reading an offset for following match. In some extreme corner cases when compressed data is suitably corrupted, UAF will occur. As reported by KASAN [1], LZ4_decompress_safe_partial may lead to read out of bound problem during decoding. lz4 upstream has fixed it [2] and this issue has been disscussed here [3] before. current decompression routine was ported from lz4 v1.8.3, bumping lib/lz4 to v1.9.+ is certainly a huge work to be done later, so, we'd better fix it first. [1] https://lore.kernel.org/all/000000000000830d1205cf7f0477@google.com/ [2] c5d6f8a8be# [3] https://lore.kernel.org/all/CC666AE8-4CA4-4951-B6FB-A2EFDE3AC03B@fb.com/ Link: https://lkml.kernel.org/r/20211111105048.2006070-1-guoxuenan@huawei.com Reported-by: syzbot+63d688f1d899c588fb71@syzkaller.appspotmail.com Signed-off-by: Guo Xuenan <guoxuenan@huawei.com> Reviewed-by: Nick Terrell <terrelln@fb.com> Acked-by: Gao Xiang <hsiangkao@linux.alibaba.com> Cc: Yann Collet <cyan@fb.com> Cc: Chengyang Fan <cy.fan@huawei.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-04-13 20:59:21 +02:00
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Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
lz4_compress.c	lz4: fix kernel decompression speed	2020-08-14 19:56:56 -07:00
lz4_decompress.c	lz4: fix LZ4_decompress_safe_partial read out of bound	2022-04-13 20:59:21 +02:00
lz4defs.h	lib/lz4: explicitly support in-place decompression	2020-12-15 22:46:16 -08:00
lz4hc_compress.c	lz4: fix kernel decompression speed	2020-08-14 19:56:56 -07:00