This is a note to let you know that I've just added the patch titled
drm/i915: Fix potential spectre vulnerability
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-fix-potential-spectre-vulnerability.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1a8e9bad6ef563c28ab0f8619628d5511be55431 Mon Sep 17 00:00:00 2001
From: Kunwu Chan <chentao@xxxxxxxxxx>
Date: Fri, 3 Nov 2023 11:09:22 +0000
Subject: drm/i915: Fix potential spectre vulnerability
From: Kunwu Chan <chentao@xxxxxxxxxx>
commit 1a8e9bad6ef563c28ab0f8619628d5511be55431 upstream.
Fix smatch warning:
drivers/gpu/drm/i915/gem/i915_gem_context.c:847 set_proto_ctx_sseu()
warn: potential spectre issue 'pc->user_engines' [r] (local cap)
Fixes: d4433c7600f7 ("drm/i915/gem: Use the proto-context to handle create parameters (v5)")
Cc: <stable@xxxxxxxxxxxxxxx> # v5.15+
Signed-off-by: Kunwu Chan <chentao@xxxxxxxxxx>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20231103110922.430122-1-tvrtko.ursulin@xxxxxxxxxxxxxxx
(cherry picked from commit 27b086382c22efb7e0a16442f7bdc2e120108ef3)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_context.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -844,6 +844,7 @@ static int set_proto_ctx_sseu(struct drm
if (idx >= pc->num_user_engines)
return -EINVAL;
+ idx = array_index_nospec(idx, pc->num_user_engines);
pe = &pc->user_engines[idx];
/* Only render engine supports RPCS configuration. */
Patches currently in stable-queue which might be from chentao@xxxxxxxxxx are
queue-6.6/drm-i915-fix-potential-spectre-vulnerability.patch
