dm log: fix dm_io_client leak on error paths

In create_log_context function, dm_io_client_destroy function needs
to be called, when memory allocation of disk_header, sync_bits and
recovering_bits failed, but dm_io_client_destroy is not called.

Cc: stable@kernel.org
Signed-off-by: Takahiro Yasui <tyasui@redhat.com>
Acked-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index a8c0fc7..13e2a1a 100644 (file)
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -467,6 +467,7 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
                lc->disk_header = vmalloc(buf_size);
                if (!lc->disk_header) {
                        DMWARN("couldn't allocate disk log buffer");
+                       dm_io_client_destroy(lc->io_req.client);
                        kfree(lc);
                        return -ENOMEM;
                }
@@ -482,6 +483,8 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
                DMWARN("couldn't allocate sync bitset");
                if (!dev)
                        vfree(lc->clean_bits);
+               else
+                       dm_io_client_destroy(lc->io_req.client);
                vfree(lc->disk_header);
                kfree(lc);
                return -ENOMEM;
@@ -495,6 +498,8 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
                vfree(lc->sync_bits);
                if (!dev)
                        vfree(lc->clean_bits);
+               else
+                       dm_io_client_destroy(lc->io_req.client);
                vfree(lc->disk_header);
                kfree(lc);
                return -ENOMEM;