lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20250925170223.18238-1-bgurney@redhat.com>
Date: Thu, 25 Sep 2025 13:02:23 -0400
From: Bryan Gurney <bgurney@...hat.com>
To: linux-nvme@...ts.infradead.org,
	kbusch@...nel.org,
	hch@....de,
	sagi@...mberg.me,
	axboe@...nel.dk
Cc: james.smart@...adcom.com,
	njavali@...vell.com,
	linux-scsi@...r.kernel.org,
	hare@...e.de,
	linux-hardening@...r.kernel.org,
	kees@...nel.org,
	gustavoars@...nel.org,
	bgurney@...hat.com,
	jmeneghi@...hat.com,
	emilne@...hat.com
Subject: [PATCH RFC] scsi: qla2xxx: zero default_item last in qla24xx_free_purex_item

In order to avoid a null pointer dereference, the vha->default_item
should be set to 0 last if the item pointer passed to the function
matches.

BUG: kernel NULL pointer dereference, address: 0000000000000936
...
RIP: 0010:qla24xx_free_purex_item+0x5e/0x90 [qla2xxx]
...
Call Trace:
 <TASK>
 qla24xx_process_purex_list+0xda/0x110 [qla2xxx]
 qla2x00_do_dpc+0x8ac/0xab0 [qla2xxx]
 ? __pfx_qla2x00_do_dpc+0x10/0x10 [qla2xxx]
 kthread+0xf9/0x240
 ? __pfx_kthread+0x10/0x10
 ret_from_fork+0xf1/0x110
 ? __pfx_kthread+0x10/0x10

Also use a local variable to avoid multiple de-referencing of the item.

Fixes: 6f4b10226b6b ("scsi: qla2xxx: Fix memcpy() field-spanning write issue")
Signed-off-by: Bryan Gurney <bgurney@...hat.com>
---
 drivers/scsi/qla2xxx/qla_os.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 98a5c105fdfd..7e28c7e9aa60 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -6459,9 +6459,11 @@ void qla24xx_process_purex_rdp(struct scsi_qla_host *vha,
 void
 qla24xx_free_purex_item(struct purex_item *item)
 {
-	if (item == &item->vha->default_item) {
-		memset(&item->vha->default_item, 0, sizeof(struct purex_item));
-		memset(&item->vha->__default_item_iocb, 0, QLA_DEFAULT_PAYLOAD_SIZE);
+	scsi_qla_host_t *base_vha = item->vha;
+
+	if (item == &base_vha->default_item) {
+		memset(&base_vha->__default_item_iocb, 0, QLA_DEFAULT_PAYLOAD_SIZE);
+		memset(&base_vha->default_item, 0, sizeof(struct purex_item));
 	} else
 		kfree(item);
 }
-- 
2.51.0


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ