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Commit f9d8b8ba authored by Gaosheng Cui's avatar Gaosheng Cui Committed by Greg Kroah-Hartman
Browse files

scsi: snic: Fix possible UAF in snic_tgt_create() 



[ Upstream commit e118df492320176af94deec000ae034cc92be754 ]

Smatch reports a warning as follows:

drivers/scsi/snic/snic_disc.c:307 snic_tgt_create() warn:
  '&tgt->list' not removed from list

If device_add() fails in snic_tgt_create(), tgt will be freed, but
tgt->list will not be removed from snic->disc.tgt_list, then list traversal
may cause UAF.

Remove from snic->disc.tgt_list before free().

Fixes: c8806b6c ("snic: driver for Cisco SCSI HBA")
Signed-off-by: default avatarGaosheng Cui <cuigaosheng1@huawei.com>
Link: https://lore.kernel.org/r/20221117035100.2944812-1-cuigaosheng1@huawei.com


Acked-by: default avatarNarsimhulu Musini <nmusini@cisco.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent d581303d

drivers/scsi/snic/snic_disc.c

+3 −0
Original line number Diff line number Diff line
@@ -317,6 +317,9 @@ snic_tgt_create(struct snic *snic, struct snic_tgt_id *tgtid) 
			      ret);



		put_device(&snic->shost->shost_gendev);

		spin_lock_irqsave(snic->shost->host_lock, flags);

		list_del(&tgt->list);

		spin_unlock_irqrestore(snic->shost->host_lock, flags);

		kfree(tgt);

		tgt = NULL;