From: Alexandra Diupina adiupina@astralinux.ru
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 vtelezhnikov@astralinux.ru Signed-off-by: Vladimir Telezhnikov vtelezhnikov@astralinux.ru Signed-off-by: Alexandra Diupina adiupina@astralinux.ru Link: https://lore.kernel.org/r/20230728123521.18293-1-adiupina@astralinux.ru 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 @@ -1599,7 +1599,7 @@ 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);