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ASoC: dapm: fix a memory leak bug

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In snd_soc_dapm_new_control_unlocked(), a kernel buffer is allocated in
dapm_cnew_widget() to hold the new dapm widget. Then, different actions are
taken according to the id of the widget, i.e., 'w->id'. If any failure
occurs during this process, snd_soc_dapm_new_control_unlocked() should be
terminated by going to the 'request_failed' label. However, the allocated
kernel buffer is not freed on this code path, leading to a memory leak bug.

To fix the above issue, free the buffer before returning from
snd_soc_dapm_new_control_unlocked() through the 'request_failed' label.

Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
Link: https://lore.kernel.org/r/1563803864-2809-1-git-send-email-wang6495@umn.edu
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Wenwen Wang 2019-07-22 08:57:44 -05:00 committed by Mark Brown
parent 62ec3d1360
commit 45004d66f2
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1 changed files with 2 additions and 0 deletions
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sound/soc/soc-dapm.c
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@ -3704,6 +3704,8 @@ snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
w->name, ret);
kfree_const(w->sname);
kfree(w);
return ERR_PTR(ret);
}