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async_xor: check src_offs is not NULL before updating it

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When PAGE_SIZE is greater than 4kB, multiple stripes may share the same
page. Thus, src_offs is added to async_xor_offs() with array of offsets.
However, async_xor() passes NULL src_offs to async_xor_offs(). In such
case, src_offs should not be updated. Add a check before the update.

Fixes: ceaf2966ab08(async_xor: increase src_offs when dropping destination page)
Cc: stable@vger.kernel.org # v5.10+
Reported-by: Oleksandr Shchirskyi <oleksandr.shchirskyi@linux.intel.com>
Tested-by: Oleksandr Shchirskyi <oleksandr.shchirskyi@intel.com>
Signed-off-by: Xiao Ni <xni@redhat.com>
Signed-off-by: Song Liu <song@kernel.org>
This commit is contained in:
Xiao Ni 2021-05-28 14:16:38 +08:00 committed by Song Liu
parent 41fe8d088e
commit 9be148e408
1 changed files with 2 additions and 1 deletions
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3
crypto/async_tx/async_xor.c
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@ -233,7 +233,8 @@ async_xor_offs(struct page *dest, unsigned int offset,
if (submit->flags & ASYNC_TX_XOR_DROP_DST) { if (submit->flags & ASYNC_TX_XOR_DROP_DST) {
src_cnt--; src_cnt--;
src_list++; src_list++;
src_offs++; if (src_offs)
src_offs++;
} }
/* wait for any prerequisite operations */ /* wait for any prerequisite operations */