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cciss: Make cciss_seq_show handle holes in the h->drv[] array

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commit 531c2dc70d339c5dfa8c3eb628c3459dc6f3a075 upstream.

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>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Stephen M. Cameron
2010-02-05 13:14:04 +01:00
committed by Greg Kroah-Hartman
parent 77e4ffd96c
commit b7f7ed5565
1 changed files with 3 additions and 0 deletions
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3
drivers/block/cciss.c
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@@ -323,6 +323,9 @@ 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;