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authorStephen M. Cameron <scameron@beardog.cce.hp.com>2010-02-05 13:14:04 +0100
committerJens Axboe <jens.axboe@oracle.com>2010-02-05 13:15:36 +0100
commit531c2dc70d339c5dfa8c3eb628c3459dc6f3a075 (patch)
treebb50efe41aa6293471ed4d5c281aff28d035bc6a /drivers
parentcfq-iosched: split seeky coop queues after one slice (diff)
downloadlinux-531c2dc70d339c5dfa8c3eb628c3459dc6f3a075.tar.xz
linux-531c2dc70d339c5dfa8c3eb628c3459dc6f3a075.zip
cciss: Make cciss_seq_show handle holes in the h->drv[] array
It is possible (and expected) for there to be holes in the h->drv[] array, that is, some elements may be NULL pointers. cciss_seq_show needs to be made aware of this possibility to avoid an Oops. To reproduce the Oops which this fixes: 1) Create two "arrays" in the Array Configuratino Utility and several logical drives on each array. 2) cat /proc/driver/cciss/cciss* in an infinite loop 3) delete some of the logical drives in the first "array." Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com> Cc: stable@kernel.org Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/block/cciss.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 873e594860d3..9291614ac6b7 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -337,6 +337,9 @@ static int cciss_seq_show(struct seq_file *seq, void *v)
if (*pos > h->highest_lun)
return 0;
+ if (drv == NULL) /* it's possible for h->drv[] to have holes. */
+ return 0;
+
if (drv->heads == 0)
return 0;