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drm: fix a memleak on mutex failure path

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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>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Oleg Drokin 2015-04-27 11:36:46 -04:00 committed by Daniel Vetter
parent 3671c580e5
commit ed1817036b
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/drm_modeset_lock.c
View File

@ -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);