[PATCH 6.4 192/206] scsi: 53c700: Check that command slot is not NULL
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2023-08-13 21:32:54
Also in:
linux-patches
From: Alexandra Diupina <redacted>
commit 8366d1f1249a0d0bba41d0bd1298d63e5d34c7f7 upstream.
Add a check for the command slot value to avoid dereferencing a NULL
pointer.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Co-developed-by: Vladimir Telezhnikov <redacted>
Signed-off-by: Vladimir Telezhnikov <redacted>
Signed-off-by: Alexandra Diupina <redacted>
Link: https://lore.kernel.org/r/20230728123521.18293-1-adiupina@astralinux.ru (local)
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/scsi/53c700.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/scsi/53c700.c
+++ b/drivers/scsi/53c700.c@@ -1598,7 +1598,7 @@ NCR_700_intr(int irq, void *dev_id) printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG))); #endif resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch; - } else if(dsp >= to32bit(&slot->pSG[0].ins) && + } else if (slot && dsp >= to32bit(&slot->pSG[0].ins) && dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) { int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff; int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);