5.15-stable review patch. If anyone has any objections, please let me know.
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From: Andrew Ballance andrewjballance@gmail.com
[ Upstream commit 9931122d04c6d431b2c11b5bb7b10f28584067f0 ]
A incorrectly formatted chunk may decompress into more than LZNT_CHUNK_SIZE bytes and a index out of bounds will occur in s_max_off.
Signed-off-by: Andrew Ballance andrewjballance@gmail.com Signed-off-by: Konstantin Komarov almaz.alexandrovich@paragon-software.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ntfs3/lznt.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/ntfs3/lznt.c b/fs/ntfs3/lznt.c index 28f654561f279..09db01c1098cd 100644 --- a/fs/ntfs3/lznt.c +++ b/fs/ntfs3/lznt.c @@ -236,6 +236,9 @@ static inline ssize_t decompress_chunk(u8 *unc, u8 *unc_end, const u8 *cmpr,
/* Do decompression until pointers are inside range. */ while (up < unc_end && cmpr < cmpr_end) { + // return err if more than LZNT_CHUNK_SIZE bytes are written + if (up - unc > LZNT_CHUNK_SIZE) + return -EINVAL; /* Correct index */ while (unc + s_max_off[index] < up) index += 1;