From: Oleg Drokin green@linuxhacker.ru
Need to free just allocated ctx allocation if we cannot get our config mutex.
This one has been flagged by kbuild bot all the way back in August, but somehow nobody picked it up: https://lists.01.org/pipermail/kbuild/2014-August/001691.html
In addition there is another failure path that leaks the same ctx reference that is fixed.
Found with smatch.
Signed-off-by: Oleg Drokin green@linuxhacker.ru CC: Daniel Vetter daniel.vetter@ffwll.ch --- drivers/gpu/drm/drm_modeset_lock.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c index 51cc47d..c0a5cd8 100644 --- a/drivers/gpu/drm/drm_modeset_lock.c +++ b/drivers/gpu/drm/drm_modeset_lock.c @@ -80,8 +80,10 @@ int __drm_modeset_lock_all(struct drm_device *dev, return -ENOMEM;
if (trylock) { - if (!mutex_trylock(&config->mutex)) - return -EBUSY; + if (!mutex_trylock(&config->mutex)) { + ret = -EBUSY; + goto out; + } } else { mutex_lock(&config->mutex); } @@ -114,6 +116,8 @@ fail: goto retry; }
+out: + kfree(ctx); return ret; } EXPORT_SYMBOL(__drm_modeset_lock_all);