erofs: fix out-of-bound read for shifted uncompressed block

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commit 4d2024370d upstream.

rq->out[1] should be valid before accessing. Otherwise,
in very rare cases, out-of-bound dirty onstack rq->out[1]
can equal to *in and lead to unintended memmove behavior.

Link: https://lore.kernel.org/r/20200107022546.19432-1-gaoxiang25@huawei.com
Fixes: 7fc45dbc93 ("staging: erofs: introduce generic decompression backend")
Cc: <stable@vger.kernel.org> # 5.3+
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Gao Xiang 2020-01-07 10:25:46 +08:00 • committed by Greg Kroah-Hartman

parent 483406427e

commit 88a98d3cf0

1 changed files with 10 additions and 12 deletions

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fs/erofs/decompressor.c

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