linux-kernel - [PATCH] drm/i915: Fix potential spectre vulnerability

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Message-Id: <20231102101642.52988-1-chentao@kylinos.cn>
Date:   Thu,  2 Nov 2023 18:16:42 +0800
From:   chentao <chentao@...inos.cn>
To:     jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, tvrtko.ursulin@...ux.intel.com,
        airlied@...il.com, daniel@...ll.ch, andi.shyti@...ux.intel.com,
        robdclark@...omium.org, jonathan.cavitt@...el.com,
        andrzej.hajda@...el.com, chris.p.wilson@...el.com,
        alan.previn.teres.alexis@...el.com
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, kunwu.chan@...mail.com,
        chentao <chentao@...inos.cn>
Subject: [PATCH] drm/i915: Fix potential spectre vulnerability

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)

Signed-off-by: chentao <chentao@...inos.cn>
---
 drivers/gpu/drm/i915/gem/i915_gem_context.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 9a9ff84c90d7..b2fdfc7ca4de 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -843,7 +843,7 @@ static int set_proto_ctx_sseu(struct drm_i915_file_private *fpriv,
 
 		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. */
-- 
2.34.1