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dm log userspace: fix memory leak in dm_ulog_tfr_init failure path

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If cn_add_callback() fails in dm_ulog_tfr_init(), it does not
deallocate prealloced memory but calls cn_del_callback().

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <[email protected]>
Reviewed-by: Jonathan Brassow <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Cc: [email protected]
This commit is contained in:
Alexey Khoroshilov 2014-10-01 22:58:35 +02:00 • committed by Mike Snitzer
commit 56ec16cb1e
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-log-userspace-transfer.c
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@ -272,7 +272,7 @@ int dm_ulog_tfr_init(void)
r = cn_add_callback(&ulog_cn_id, "dmlogusr", cn_ulog_callback);
if (r) {
cn_del_callback(&ulog_cn_id);
kfree(prealloced_cn_msg);
return r;
}