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authorMarcin Slusarz <marcin.slusarz@gmail.com>2011-04-19 23:50:48 +0200
committerBen Skeggs <bskeggs@redhat.com>2011-04-20 08:51:31 +1000
commita18d89ca026140eb8ac4459bf70a01c571dd9a32 (patch)
tree8268eb40c5617340c34e4b6486106c8191c4e049 /drivers
parent11dea1a2144f24216551fbeddacbde0980ae8a55 (diff)
drm/nouveau: fix notifier memory corruption bug
nouveau_bo_wr32 expects offset to be in words, but we pass value in bytes, so after commit 73412c3854c877e5f37ad944ee8977addde4d35a ("drm/nouveau: allocate kernel's notifier object at end of block") we started to overwrite some memory after notifier buffer object (previously m2mf_ntfy was always 0, so it didn't matter it was a value in bytes). Reported-by: Dominik Brodowski <linux@dominikbrodowski.net> Reported-by: Nigel Cunningham <lkml@nigelcunningham.com.au> Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com> Cc: Ben Skeggs <bskeggs@redhat.com> Cc: Pekka Paalanen <pq@iki.fi> Cc: stable@kernel.org [2.6.38] Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_fbcon.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.c b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
index 889c4454682..39aee6d4daf 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fbcon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
@@ -181,13 +181,13 @@ nouveau_fbcon_sync(struct fb_info *info)
OUT_RING (chan, 0);
}
- nouveau_bo_wr32(chan->notifier_bo, chan->m2mf_ntfy + 3, 0xffffffff);
+ nouveau_bo_wr32(chan->notifier_bo, chan->m2mf_ntfy/4 + 3, 0xffffffff);
FIRE_RING(chan);
mutex_unlock(&chan->mutex);
ret = -EBUSY;
for (i = 0; i < 100000; i++) {
- if (!nouveau_bo_rd32(chan->notifier_bo, chan->m2mf_ntfy + 3)) {
+ if (!nouveau_bo_rd32(chan->notifier_bo, chan->m2mf_ntfy/4 + 3)) {
ret = 0;
break;
}