[patch 053/100] SCSI: libiscsi: fix iscsi pool error path

Chris Wright
2009-04-23T07:58:44Z

[-- Attachment #1: scsi-libiscsi-fix-iscsi-pool-error-path.patch --]
[-- Type: text/plain, Size: 1543 bytes --]

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

From: Jean Delvare <jdelvare@suse.de>

upstream commit: f474a37bc48667595b5653a983b635c95ed82a3b

Memory freeing in iscsi_pool_free() looks wrong to me. Either q->pool
can be NULL and this should be tested before dereferencing it, or it
can't be NULL and it shouldn't be tested at all. As far as I can see,
the only case where q->pool is NULL is on early error in
iscsi_pool_init(). One possible way to fix the bug is thus to not
call iscsi_pool_free() in this case (nothing needs to be freed anyway)
and then we can get rid of the q->pool check.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
drivers/scsi/libiscsi.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -1944,7 +1944,7 @@ iscsi_pool_init(struct iscsi_pool *q, in
num_arrays++;
q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
if (q->pool == NULL)
- goto enomem;
+ return -ENOMEM;

q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
GFP_KERNEL, NULL);
@@ -1979,8 +1979,7 @@ void iscsi_pool_free(struct iscsi_pool *

for (i = 0; i < q->max; i++)
kfree(q->pool[i]);
- if (q->pool)
- kfree(q->pool);
+ kfree(q->pool);
kfree(q->queue);
}
EXPORT_SYMBOL_GPL(iscsi_pool_free);