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scsi: core: Fix a scsi_show_rq() NULL pointer dereference
Avoid that scsi_show_rq() triggers a NULL pointer dereference if called
after sd_uninit_command(). Swap the NULL pointer assignment and the
mempool_free() call in sd_uninit_command() to make it less likely that
scsi_show_rq() triggers a use-after-free. Note: even with these changes
scsi_show_rq() can trigger a use-after-free but that's a lesser evil
than e.g. suppressing debug information for T10 PI Type 2 commands
completely. This patch fixes the following oops:
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: scsi_format_opcode_name+0x1a/0x1c0
CPU: 1 PID: 1881 Comm: cat Not tainted 4.14.0-rc2.blk_mq_io_hang+ #516
Call Trace:
__scsi_format_command+0x27/0xc0
scsi_show_rq+0x5c/0xc0
__blk_mq_debugfs_rq_show+0x116/0x130
blk_mq_debugfs_rq_show+0xe/0x10
seq_read+0xfe/0x3b0
full_proxy_read+0x54/0x90
__vfs_read+0x37/0x160
vfs_read+0x96/0x130
SyS_read+0x55/0xc0
entry_SYSCALL_64_fastpath+0x1a/0xa5
[mkp: added Type 2]
Fixes: 0eebd005dd
("scsi: Implement blk_mq_ops.show_rq()")
Reported-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: James E.J. Bottomley <jejb@linux.vnet.ibm.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Cc: stable@vger.kernel.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
parent
3e5c63565a
commit
14e3062fb1
2 changed files with 7 additions and 3 deletions
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@ -8,9 +8,11 @@ void scsi_show_rq(struct seq_file *m, struct request *rq)
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{
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struct scsi_cmnd *cmd = container_of(scsi_req(rq), typeof(*cmd), req);
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int msecs = jiffies_to_msecs(jiffies - cmd->jiffies_at_alloc);
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char buf[80];
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const u8 *const cdb = READ_ONCE(cmd->cmnd);
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char buf[80] = "(?)";
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__scsi_format_command(buf, sizeof(buf), cmd->cmnd, cmd->cmd_len);
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if (cdb)
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__scsi_format_command(buf, sizeof(buf), cdb, cmd->cmd_len);
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seq_printf(m, ", .cmd=%s, .retries=%d, allocated %d.%03d s ago", buf,
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cmd->retries, msecs / 1000, msecs % 1000);
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}
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@ -1312,6 +1312,7 @@ static int sd_init_command(struct scsi_cmnd *cmd)
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static void sd_uninit_command(struct scsi_cmnd *SCpnt)
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{
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struct request *rq = SCpnt->request;
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u8 *cmnd;
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if (SCpnt->flags & SCMD_ZONE_WRITE_LOCK)
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sd_zbc_write_unlock_zone(SCpnt);
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@ -1320,9 +1321,10 @@ static void sd_uninit_command(struct scsi_cmnd *SCpnt)
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__free_page(rq->special_vec.bv_page);
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if (SCpnt->cmnd != scsi_req(rq)->cmd) {
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mempool_free(SCpnt->cmnd, sd_cdb_pool);
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cmnd = SCpnt->cmnd;
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SCpnt->cmnd = NULL;
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SCpnt->cmd_len = 0;
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mempool_free(cmnd, sd_cdb_pool);
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}
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}
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