From: Marcin Slusarz Date: Tue, 19 Apr 2011 21:50:48 +0000 (+0200) Subject: drm/nouveau: fix notifier memory corruption bug X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a18d89ca026140eb8ac4459bf70a01c571dd9a32;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git 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 Reported-by: Nigel Cunningham Signed-off-by: Marcin Slusarz Cc: Ben Skeggs Cc: Pekka Paalanen Cc: stable@kernel.org [2.6.38] Signed-off-by: Ben Skeggs --- 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; }