From: "kernel-team@fedoraproject.org" Date: Fri, 10 Feb 2012 14:56:13 -0500 Subject: [PATCH] scsi: sd_revalidate_disk prevent NULL ptr deref Bugzilla: 754518 Upstream-status: Fedora mustard (might be worth dropping...) --- drivers/scsi/sd.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 05ea0d49a3a3..95f18e07491b 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -2750,13 +2750,18 @@ static int sd_try_extended_inquiry(struct scsi_device *sdp) static int sd_revalidate_disk(struct gendisk *disk) { struct scsi_disk *sdkp = scsi_disk(disk); - struct scsi_device *sdp = sdkp->device; + struct scsi_device *sdp; unsigned char *buffer; unsigned int max_xfer; SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_revalidate_disk\n")); + if (WARN_ONCE((!sdkp), "Invalid scsi_disk from %p\n", disk)) + goto out; + + sdp = sdkp->device; + /* * If the device is offline, don't try and read capacity or any * of the other niceties. -- 2.1.0