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drm/i915: Fix potential spectre vulnerability

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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: d4433c7600 ("drm/i915/gem: Use the proto-context to handle create parameters (v5)")
Cc: <stable@vger.kernel.org> # v5.15+
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231103110922.430122-1-tvrtko.ursulin@linux.intel.com
(cherry picked from commit 27b086382c22efb7e0a16442f7bdc2e120108ef3)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kunwu Chan 2023-11-03 11:09:22 +00:00 committed by Greg Kroah-Hartman
parent 9457636a49
commit 07e94f204f
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/i915/gem/i915_gem_context.c
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@ -844,6 +844,7 @@ 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. */