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| author | Luis Henriques <lhenriques@suse.com> | 2018-06-18 17:08:03 +0100 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-06-18 22:16:13 -0400 |
| commit | 52ab9768f723823a71dc659f0fad803a90f80236 (patch) | |
| tree | 51e1682308d4637a5cf96d8b03087f63cbe0be16 /drivers/scsi/scsi_debug.c | |
| parent | 49d7bd36813ea8e6b4c97b640d24e7fbd44c84f0 (diff) | |
| download | linux-52ab9768f723823a71dc659f0fad803a90f80236.tar.gz linux-52ab9768f723823a71dc659f0fad803a90f80236.tar.bz2 linux-52ab9768f723823a71dc659f0fad803a90f80236.zip | |
scsi: scsi_debug: Fix memory leak on module unload
Since commit 80c49563e250 ("scsi: scsi_debug: implement IMMED bit") there
are long delays in F_SYNC_DELAY and F_SSU_DELAY. This can cause a memory
leak in schedule_resp(), which can be invoked while unloading the
scsi_debug module: free_all_queued() had already freed all sd_dp and
schedule_resp will alloc a new one, which will never get freed. Here's the
kmemleak report while running xfstests generic/350:
unreferenced object 0xffff88007d752b00 (size 128):
comm "rmmod", pid 26940, jiffies 4295816945 (age 7.588s)
hex dump (first 32 bytes):
00 2b 75 7d 00 88 ff ff 00 00 00 00 00 00 00 00 .+u}............
00 00 00 00 00 00 00 00 8e 31 a2 34 5f 03 00 00 .........1.4_...
backtrace:
[<000000002abd83d0>] 0xffffffffa000705e
[<000000004c063fda>] scsi_dispatch_cmd+0xc7/0x1a0
[<000000000c119a00>] scsi_request_fn+0x251/0x550
[<000000009de0c736>] __blk_run_queue+0x3f/0x60
[<000000001c4453c8>] blk_execute_rq_nowait+0x98/0xd0
[<00000000d17ec79f>] blk_execute_rq+0x3a/0x50
[<00000000a7654b6e>] scsi_execute+0x113/0x250
[<00000000fd78f7cd>] sd_sync_cache+0x95/0x160
[<0000000024dacb14>] sd_shutdown+0x9b/0xd0
[<00000000e9101710>] sd_remove+0x5f/0xb0
[<00000000c43f0d63>] device_release_driver_internal+0x13c/0x1f0
[<00000000e8ad57b6>] bus_remove_device+0xe9/0x160
[<00000000713a7b8a>] device_del+0x120/0x320
[<00000000e5db670c>] __scsi_remove_device+0x115/0x150
[<00000000eccbef30>] scsi_forget_host+0x20/0x60
[<00000000cd5a0738>] scsi_remove_host+0x6d/0x120
Cc: stable@vger.kernel.org # v4.17+
Signed-off-by: Luis Henriques <lhenriques@suse.com>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_debug.c')
| -rw-r--r-- | drivers/scsi/scsi_debug.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 24d7496cd9e2..364e71861bfd 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -5507,9 +5507,9 @@ static void __exit scsi_debug_exit(void) int k = sdebug_add_host; stop_all_queued(); - free_all_queued(); for (; k; k--) sdebug_remove_adapter(); + free_all_queued(); driver_unregister(&sdebug_driverfs_driver); bus_unregister(&pseudo_lld_bus); root_device_unregister(pseudo_primary); |