kernel/scsi-sd_revalidate_disk-prevent-NULL-ptr-deref.patch
2014-08-08 08:47:17 -04:00

29 lines
813 B
Diff

Bugzilla: 754518
Upstream-status: Fedora mustard (might be worth dropping...)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 2c2041ca4b70..e10812d985af 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2749,13 +2749,18 @@ 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.