From: Wenwen Wang wenwen@cs.uga.edu
[ 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 --- drivers/block/xen-blkback/xenbus.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c index a4bc74e72c394..55869b362fdfb 100644 --- a/drivers/block/xen-blkback/xenbus.c +++ b/drivers/block/xen-blkback/xenbus.c @@ -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)