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Message-Id: <20220203202947.2304-34-sashal@kernel.org>
Date: Thu, 3 Feb 2022 15:29:28 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Tong Zhang <ztong0001@...il.com>, Hannes Reinecke <hare@...e.de>,
"Martin K . Petersen" <martin.petersen@...cle.com>,
Sasha Levin <sashal@...nel.org>, hare@...nel.org,
jejb@...ux.ibm.com, linux-scsi@...r.kernel.org
Subject: [PATCH AUTOSEL 5.16 34/52] scsi: myrs: Fix crash in error case
From: Tong Zhang <ztong0001@...il.com>
[ Upstream commit 4db09593af0b0b4d7d4805ebb3273df51d7cc30d ]
In myrs_detect(), cs->disable_intr is NULL when privdata->hw_init() fails
with non-zero. In this case, myrs_cleanup(cs) will call a NULL ptr and
crash the kernel.
[ 1.105606] myrs 0000:00:03.0: Unknown Initialization Error 5A
[ 1.105872] myrs 0000:00:03.0: Failed to initialize Controller
[ 1.106082] BUG: kernel NULL pointer dereference, address: 0000000000000000
[ 1.110774] Call Trace:
[ 1.110950] myrs_cleanup+0xe4/0x150 [myrs]
[ 1.111135] myrs_probe.cold+0x91/0x56a [myrs]
[ 1.111302] ? DAC960_GEM_intr_handler+0x1f0/0x1f0 [myrs]
[ 1.111500] local_pci_probe+0x48/0x90
Link: https://lore.kernel.org/r/20220123225717.1069538-1-ztong0001@gmail.com
Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Tong Zhang <ztong0001@...il.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/scsi/myrs.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/myrs.c b/drivers/scsi/myrs.c
index 6ea323e9a2e34..f6dbc8f2f60a3 100644
--- a/drivers/scsi/myrs.c
+++ b/drivers/scsi/myrs.c
@@ -2269,7 +2269,8 @@ static void myrs_cleanup(struct myrs_hba *cs)
myrs_unmap(cs);
if (cs->mmio_base) {
- cs->disable_intr(cs);
+ if (cs->disable_intr)
+ cs->disable_intr(cs);
iounmap(cs->mmio_base);
cs->mmio_base = NULL;
}
--
2.34.1
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