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xen/blkback: fix memory leaks

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[ Upstream commit ae78ca3cf3d9e9f914bfcd0bc5c389ff18b9c2e0 ]

In read_per_ring_refs(), after 'req' and related memory regions are
allocated, xen_blkif_map() is invoked to map the shared frame, irq, and
etc. However, if this mapping process fails, no cleanup is performed,
leading to memory leaks. To fix this issue, invoke the cleanup before
returning the error.

Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wenwen Wang 2019-08-11 12:23:22 -05:00 committed by Greg Kroah-Hartman
parent 339c1572a2
commit eb535aaf3c
1 changed files with 3 additions and 3 deletions
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6
drivers/block/xen-blkback/xenbus.c
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@ -974,6 +974,7 @@ static int read_per_ring_refs(struct xen_blkif_ring *ring, const char *dir)
}
blkif->nr_ring_pages = nr_grefs;
err = -ENOMEM;
for (i = 0; i < nr_grefs * XEN_BLKIF_REQS_PER_PAGE; i++) {
req = kzalloc(sizeof(*req), GFP_KERNEL);
if (!req)
@ -996,7 +997,7 @@ static int read_per_ring_refs(struct xen_blkif_ring *ring, const char *dir)
err = xen_blkif_map(ring, ring_ref, nr_grefs, evtchn);
if (err) {
xenbus_dev_fatal(dev, err, "mapping ring-ref port %u", evtchn);
return err;
goto fail;
}
return 0;
@ -1016,8 +1017,7 @@ static int read_per_ring_refs(struct xen_blkif_ring *ring, const char *dir)
}
kfree(req);
}
return -ENOMEM;
return err;
}
static int connect_ring(struct backend_info *be)