[patch 01/26] drivers/scsi/dpt_i2o.c: fix a user-after-free

Greg KH
2005-12-13T08:28:57Z

[-- Attachment #1: dpt_i2o-fix-a-null-pointer-deref.patch --]
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-stable review patch. If anyone has any objections, please let us know.

------------------

From: Adrian Bunk <bunk@stusta.de>

The Coverity checker spotted this obvious use-after-free

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Acked-by: Mark Salyzyn <mark_salyzyn@adaptec.com>
Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/scsi/dpt_i2o.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

--- linux-2.6.14.3.orig/drivers/scsi/dpt_i2o.c
+++ linux-2.6.14.3/drivers/scsi/dpt_i2o.c
@@ -816,7 +816,7 @@ static int adpt_hba_reset(adpt_hba* pHba
static void adpt_i2o_sys_shutdown(void)
{
adpt_hba *pHba, *pNext;
- struct adpt_i2o_post_wait_data *p1, *p2;
+ struct adpt_i2o_post_wait_data *p1, *old;

printk(KERN_INFO"Shutting down Adaptec I2O controllers.\n");
printk(KERN_INFO" This could take a few minutes if there are many devices attached\n");
@@ -830,13 +830,14 @@ static void adpt_i2o_sys_shutdown(void)
}

/* Remove any timedout entries from the wait queue. */
- p2 = NULL;
// spin_lock_irqsave(&adpt_post_wait_lock, flags);
/* Nothing should be outstanding at this point so just
* free them
*/
- for(p1 = adpt_post_wait_queue; p1; p2 = p1, p1 = p2->next) {
- kfree(p1);
+ for(p1 = adpt_post_wait_queue; p1;) {
+ old = p1;
+ p1 = p1->next;
+ kfree(old);
}
// spin_unlock_irqrestore(&adpt_post_wait_lock, flags);
adpt_post_wait_queue = NULL;

--