[patch 054/100] SCSI: libiscsi: fix iscsi pool error path (fixlet)

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Jean Delvare <jdelvare@xxxxxxx>

upstream commit: fd6e1c14b73dbab89cb76af895d5612e4a8b5522

Le lundi 30 mars 2009, Chris Wright a écrit :
> q->queue could be ERR_PTR(-ENOMEM) which will break unwinding
> on error.  Make iscsi_pool_free more defensive.
>

Making the freeing of q->queue dependent on q->pool being set looks
really weird (although it is correct at the moment. But this seems
to be fixable in a much simpler way.

With the benefit that only the error case is slowed down. In both
cases we have a problem if q->queue contains an error value but it's
not -ENOMEM. Apparently this can't happen today, but it doesn't feel
right to assume this will always be true. Maybe it's the right time
to fix this as well.

Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
Signed-off-by: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
[chrisw: this is a fixlet to f474a37b, also in -stable]
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 drivers/scsi/libiscsi.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -1948,8 +1948,10 @@ iscsi_pool_init(struct iscsi_pool *q, in
 
 	q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
 			      GFP_KERNEL, NULL);
-	if (q->queue == ERR_PTR(-ENOMEM))
+	if (IS_ERR(q->queue)) {
+		q->queue = NULL;
 		goto enomem;
+	}
 
 	for (i = 0; i < max; i++) {
 		q->pool[i] = kzalloc(item_size, GFP_KERNEL);

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