linux-kernel - [ 16/33] drm/radeon: fix NULL pointer dereference in UMS mode

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: <20130119010351.457566020@linuxfoundation.org>
Date:	Fri, 18 Jan 2013 17:16:41 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Ilija Hadzic <ihadzic@...earch.bell-labs.com>,
	Alex Deucher <alexander.deucher@....com>,
	CAI Qian <caiqian@...hat.com>
Subject: [ 16/33] drm/radeon: fix NULL pointer dereference in UMS mode

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

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

From: Ilija Hadzic <ihadzic@...earch.bell-labs.com>

commit ff4bd0827764e10a428a9d39e6814c5478863f94 upstream.

In UMS mode parser->rdev is NULL, so dereferencing
will cause an oops.

Signed-off-by: Ilija Hadzic <ihadzic@...earch.bell-labs.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Cc: CAI Qian <caiqian@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/radeon/radeon_cs.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -266,7 +266,7 @@ int radeon_cs_parser_init(struct radeon_
 				  p->chunks[p->chunk_ib_idx].length_dw);
 			return -EINVAL;
 		}
-		if ((p->rdev->flags & RADEON_IS_AGP)) {
+		if (p->rdev && (p->rdev->flags & RADEON_IS_AGP)) {
 			p->chunks[p->chunk_ib_idx].kpage[0] = kmalloc(PAGE_SIZE, GFP_KERNEL);
 			p->chunks[p->chunk_ib_idx].kpage[1] = kmalloc(PAGE_SIZE, GFP_KERNEL);
 			if (p->chunks[p->chunk_ib_idx].kpage[0] == NULL ||
@@ -570,7 +570,8 @@ static int radeon_cs_update_pages(struct
 	struct radeon_cs_chunk *ibc = &p->chunks[p->chunk_ib_idx];
 	int i;
 	int size = PAGE_SIZE;
-	bool copy1 = (p->rdev->flags & RADEON_IS_AGP) ? false : true;
+	bool copy1 = (p->rdev && (p->rdev->flags & RADEON_IS_AGP)) ?
+		false : true;
 
 	for (i = ibc->last_copied_page + 1; i < pg_idx; i++) {
 		if (DRM_COPY_FROM_USER(p->ib.ptr + (i * (PAGE_SIZE/4)),


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/