On Tue, Nov 25 2014 at 8:45pm -0500, Darrick J. Wong <[email protected]> wrote:
> 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! > > Fix is against 3.18-rc6. > > Signed-off-by: Darrick J. Wong <[email protected]> Thanks for reporting/fixing this. Alternatively I think we could just call bio_reset() in submit_io(), e.g.: diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c index afe7971..e7036e3 100644 --- a/drivers/md/dm-bufio.c +++ b/drivers/md/dm-bufio.c @@ -579,6 +579,8 @@ static void submit_io(struct dm_buffer *b, int rw, sector_t block, if (rw == WRITE && b->c->write_callback) b->c->write_callback(b); + bio_reset(&b->bio); + if (b->c->block_size <= DM_BUFIO_INLINE_VECS * PAGE_SIZE && b->data_mode != DATA_MODE_VMALLOC) use_inline_bio(b, rw, block, end_io); What do you think? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
