AuxXxilium/linux_dsm_epyc7002
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dm integrity: fix logic bug in integrity tag testing

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If all the bytes are equal to DISCARD_FILLER, we want to accept the
buffer. If any of the bytes are different, we must do thorough
tag-by-tag checking.

The condition was inverted.

Fixes: 84597a44a9 ("dm integrity: add optional discard support")
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2020-04-03 13:05:50 -04:00 committed by Mike Snitzer
parent 120c9257f5
commit 8267d8fb48
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-integrity.c
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@ -1333,7 +1333,7 @@ static int dm_integrity_rw_tag(struct dm_integrity_c *ic, unsigned char *tag, se
if (likely(is_power_of_2(ic->tag_size))) {
if (unlikely(memcmp(dp, tag, to_copy)))
if (unlikely(!ic->discard) ||
unlikely(!memchr_inv(dp, DISCARD_FILLER, to_copy))) {
unlikely(memchr_inv(dp, DISCARD_FILLER, to_copy) != NULL)) {
goto thorough_test;
}
} else {