dm bufio: fix memleak when using a dm_buffer's inline bio

commit 445559cdcb98a141f5de415b94fd6eaccab87e6d upstream.

When dm-bufio sets out to use the bio built into a struct dm_buffer to
issue an IO, it needs to call bio_reset after it's done with the bio
so that we can free things attached to the bio such as the integrity
payload.  Therefore, inject our own endio callback to take care of
the bio_reset after calling submit_io's end_io callback.

Test case:
1. modprobe scsi_debug delay=0 dif=1 dix=199 ato=1 dev_size_mb=300
2. Set up a dm-bufio client, e.g. dm-verity, on the scsi_debug device
3. Repeatedly read metadata and watch kmalloc-192 leak!

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index c9b4ca9e0696312d174b0122d62fe354fb0ab0a9..e855a190270d59bba68ae6851f45cf90ab7b0e17 100644 (file)
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -529,6 +529,19 @@ static void use_dmio(struct dm_buffer *b, int rw, sector_t block,
                end_io(&b->bio, r);
 }
 
+static void inline_endio(struct bio *bio, int error)
+{
+       bio_end_io_t *end_fn = bio->bi_private;
+
+       /*
+        * Reset the bio to free any attached resources
+        * (e.g. bio integrity profiles).
+        */
+       bio_reset(bio);
+
+       end_fn(bio, error);
+}
+
 static void use_inline_bio(struct dm_buffer *b, int rw, sector_t block,
                           bio_end_io_t *end_io)
 {
@@ -540,7 +553,12 @@ static void use_inline_bio(struct dm_buffer *b, int rw, sector_t block,
        b->bio.bi_max_vecs = DM_BUFIO_INLINE_VECS;
        b->bio.bi_sector = block << b->c->sectors_per_block_bits;
        b->bio.bi_bdev = b->c->bdev;
-       b->bio.bi_end_io = end_io;
+       b->bio.bi_end_io = inline_endio;
+       /*
+        * Use of .bi_private isn't a problem here because
+        * the dm_buffer's inline bio is local to bufio.
+        */
+       b->bio.bi_private = end_io;
 
        /*
         * We assume that if len >= PAGE_SIZE ptr is page-aligned.