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Commit 3c737ac9 authored by Darrick J. Wong's avatar Darrick J. Wong Committed by Greg Kroah-Hartman
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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: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6fac18d0

drivers/md/dm-bufio.c

+19 −1
Original line number Diff line number Diff line
@@ -532,6 +532,19 @@ 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)

{
@@ -543,7 +556,12 @@ 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_iter.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.