6.6-stable review patch. If anyone has any objections, please let me know.
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From: Harshit Mogalapalli harshit.m.mogalapalli@oracle.com
commit 471aa951bf1206d3c10d0daa67005b8e4db4ff83 upstream.
When i915 perf interface is not available dereferencing it will lead to NULL dereferences.
As returning -ENOTSUPP is pretty clear return when perf interface is not available.
Fixes: 2fec539112e8 ("i915/perf: Replace DRM_DEBUG with driver specific drm_dbg call") Suggested-by: Tvrtko Ursulin tvrtko.ursulin@intel.com Signed-off-by: Harshit Mogalapalli harshit.m.mogalapalli@oracle.com Reviewed-by: Tvrtko Ursulin tvrtko.ursulin@intel.com Cc: stable@vger.kernel.org # v6.0+ Signed-off-by: Tvrtko Ursulin tvrtko.ursulin@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20231027172822.2753059-1-harsh... [tursulin: added stable tag] (cherry picked from commit 36f27350ff745bd228ab04d7845dfbffc177a889) Signed-off-by: Jani Nikula jani.nikula@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/i915/i915_perf.c | 15 +++------------ 1 file changed, 3 insertions(+), 12 deletions(-)
--- a/drivers/gpu/drm/i915/i915_perf.c +++ b/drivers/gpu/drm/i915/i915_perf.c @@ -4286,11 +4286,8 @@ int i915_perf_open_ioctl(struct drm_devi u32 known_open_flags; int ret;
- if (!perf->i915) { - drm_dbg(&perf->i915->drm, - "i915 perf interface not available for this system\n"); + if (!perf->i915) return -ENOTSUPP; - }
known_open_flags = I915_PERF_FLAG_FD_CLOEXEC | I915_PERF_FLAG_FD_NONBLOCK | @@ -4666,11 +4663,8 @@ int i915_perf_add_config_ioctl(struct dr struct i915_oa_reg *regs; int err, id;
- if (!perf->i915) { - drm_dbg(&perf->i915->drm, - "i915 perf interface not available for this system\n"); + if (!perf->i915) return -ENOTSUPP; - }
if (!perf->metrics_kobj) { drm_dbg(&perf->i915->drm, @@ -4832,11 +4826,8 @@ int i915_perf_remove_config_ioctl(struct struct i915_oa_config *oa_config; int ret;
- if (!perf->i915) { - drm_dbg(&perf->i915->drm, - "i915 perf interface not available for this system\n"); + if (!perf->i915) return -ENOTSUPP; - }
if (i915_perf_stream_paranoid && !perfmon_capable()) { drm_dbg(&perf->i915->drm,