md/raid10: Fix memleak in r10buf_pool_alloc

If the allocation of rep1_bio fails, we currently don't free the 'bio'
of the same dev.

Reported by kmemleak.

Signed-off-by: majianpeng <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index ec271ae4318f..fb9062b5022c 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -173,10 +173,11 @@ out_free_pages:
         while (j--)
                 for (i = 0; i < RESYNC_PAGES ; i++)
                         safe_put_page(r10_bio->devs[j].bio->bi_io_vec[i].bv_page);
-        j = -1;
+        j = 0;
 out_free_bio:
-        while (++j < nalloc) {
-                bio_put(r10_bio->devs[j].bio);
+        for ( ; j < nalloc; j++) {
+                if (r10_bio->devs[j].bio)
+                        bio_put(r10_bio->devs[j].bio);
                 if (r10_bio->devs[j].repl_bio)
                         bio_put(r10_bio->devs[j].repl_bio);
         }