diff options
| author | Guixin Liu <kanie@linux.alibaba.com> | 2025-01-07 10:20:32 +0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2025-01-10 18:07:17 -0500 |
| commit | 295006f6e8c17212d3098811166e29627d19e05c (patch) | |
| tree | f9ad4df3c984edd644f91df798027b428a910f7c /drivers/scsi/mpi3mr/mpi3mr_app.c | |
| parent | 1e95c798d8a7f70965f0f88d4657b682ff0ec75f (diff) | |
scsi: mpi3mr: Fix possible crash when setting up bsg fails
If bsg_setup_queue() fails, the bsg_queue is assigned a non-NULL value.
Consequently, in mpi3mr_bsg_exit(), the condition "if(!mrioc->bsg_queue)"
will not be satisfied, preventing execution from entering
bsg_remove_queue(), which could lead to the following crash:
BUG: kernel NULL pointer dereference, address: 000000000000041c
Call Trace:
<TASK>
mpi3mr_bsg_exit+0x1f/0x50 [mpi3mr]
mpi3mr_remove+0x6f/0x340 [mpi3mr]
pci_device_remove+0x3f/0xb0
device_release_driver_internal+0x19d/0x220
unbind_store+0xa4/0xb0
kernfs_fop_write_iter+0x11f/0x200
vfs_write+0x1fc/0x3e0
ksys_write+0x67/0xe0
do_syscall_64+0x38/0x80
entry_SYSCALL_64_after_hwframe+0x78/0xe2
Fixes: 4268fa751365 ("scsi: mpi3mr: Add bsg device support")
Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
Link: https://lore.kernel.org/r/20250107022032.24006-1-kanie@linux.alibaba.com
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/mpi3mr/mpi3mr_app.c')
| -rw-r--r-- | drivers/scsi/mpi3mr/mpi3mr_app.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/scsi/mpi3mr/mpi3mr_app.c b/drivers/scsi/mpi3mr/mpi3mr_app.c index 10b8e4dc64f8..7589f48aebc8 100644 --- a/drivers/scsi/mpi3mr/mpi3mr_app.c +++ b/drivers/scsi/mpi3mr/mpi3mr_app.c @@ -2951,6 +2951,7 @@ void mpi3mr_bsg_init(struct mpi3mr_ioc *mrioc) .max_hw_sectors = MPI3MR_MAX_APP_XFER_SECTORS, .max_segments = MPI3MR_MAX_APP_XFER_SEGMENTS, }; + struct request_queue *q; device_initialize(bsg_dev); @@ -2966,14 +2967,17 @@ void mpi3mr_bsg_init(struct mpi3mr_ioc *mrioc) return; } - mrioc->bsg_queue = bsg_setup_queue(bsg_dev, dev_name(bsg_dev), &lim, + q = bsg_setup_queue(bsg_dev, dev_name(bsg_dev), &lim, mpi3mr_bsg_request, NULL, 0); - if (IS_ERR(mrioc->bsg_queue)) { + if (IS_ERR(q)) { ioc_err(mrioc, "%s: bsg registration failed\n", dev_name(bsg_dev)); device_del(bsg_dev); put_device(bsg_dev); + return; } + + mrioc->bsg_queue = q; } /** |