dm stripe: fix potential for leak in stripe_ctr error path

Fix a potential struct stripe_c leak that would occur if the
chunk_size exceeded the maximum allowed by dm_set_target_max_io_len
(UINT_MAX).  However, in practice there is no possibility of this
occuring given that chunk_size is of type uint32_t.  But it is good to
fix this to future-proof in case dm_set_target_max_io_len's
implementation were to change.

Signed-off-by: Pavitra Kumar <pavitrak@nvidia.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index d1600d2..f8b37d4 100644 (file)
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -159,8 +159,10 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
                sc->stripes_shift = __ffs(stripes);
 
        r = dm_set_target_max_io_len(ti, chunk_size);
-       if (r)
+       if (r) {
+               kfree(sc);
                return r;
+       }
 
        ti->num_flush_bios = stripes;
        ti->num_discard_bios = stripes;