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i915/perf: Fix NULL deref bugs with drm_dbg() calls

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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: 2fec539112 ("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-harshit.m.mogalapalli@oracle.com
[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>
This commit is contained in:
Harshit Mogalapalli 2023-10-27 10:28:22 -07:00 • committed by Greg Kroah-Hartman
parent 2635504d91
commit 10f49cdfd5
1 changed files with 3 additions and 12 deletions
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15
drivers/gpu/drm/i915/i915_perf.c
View file

@ -4286,11 +4286,8 @@ int i915_perf_open_ioctl(struct drm_device *dev, void *data,
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 drm_device *dev, void *data,
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 drm_device *dev, void *data,
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,