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scsi: sg: Do not sleep in atomic context

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commit 90449f2d1e upstream.

sg_finish_rem_req() calls blk_rq_unmap_user(). The latter function may
sleep. Hence, call sg_finish_rem_req() with interrupts enabled instead
of disabled.

Reported-by: syzbot+c01f8e6e73f20459912e@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/linux-scsi/691560c4.a70a0220.3124cb.001a.GAE@google.com/
Cc: Hannes Reinecke <hare@suse.de>
Cc: stable@vger.kernel.org
Fixes: 97d27b0dd0 ("scsi: sg: close race condition in sg_remove_sfp_usercontext()")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://patch.msgid.link/20251113181643.1108973-1-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bart Van Assche
2025-11-13 10:16:43 -08:00
committed by Greg Kroah-Hartman
parent 625e173e2a
commit 6983d8375c
1 changed files with 9 additions and 1 deletions
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10
drivers/scsi/sg.c
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@@ -2209,9 +2209,17 @@ sg_remove_sfp_usercontext(struct work_struct *work)
write_lock_irqsave(&sfp->rq_list_lock, iflags); write_lock_irqsave(&sfp->rq_list_lock, iflags);
while (!list_empty(&sfp->rq_list)) { while (!list_empty(&sfp->rq_list)) {
srp = list_first_entry(&sfp->rq_list, Sg_request, entry); srp = list_first_entry(&sfp->rq_list, Sg_request, entry);
sg_finish_rem_req(srp);
list_del(&srp->entry); list_del(&srp->entry);
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
sg_finish_rem_req(srp);
/*
* sg_rq_end_io() uses srp->parentfp. Hence, only clear
* srp->parentfp after blk_mq_free_request() has been called.
*/
srp->parentfp = NULL; srp->parentfp = NULL;
write_lock_irqsave(&sfp->rq_list_lock, iflags);
} }
write_unlock_irqrestore(&sfp->rq_list_lock, iflags); write_unlock_irqrestore(&sfp->rq_list_lock, iflags);