Messages in this thread Patch in this message |  | | From | Jia-Ju Bai <> | Subject | [PATCH] opl3: Fix a possible sleep-in-atomic bug in snd_opl3_find_patch | Date | Mon, 9 Oct 2017 10:35:27 +0800 |
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The driver may sleep under a spinlock, and the function call path is: snd_opl3_note_on (acquire the spinlock) snd_opl3_find_patch kzalloc(GFP_KERNEL) --> may sleep
To fix it, GFP_KERNEL is replaced with GFP_ATOMIC. This bug is found by my static analysis tool and my code review.
Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com> --- sound/drivers/opl3/opl3_synth.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sound/drivers/opl3/opl3_synth.c b/sound/drivers/opl3/opl3_synth.c index ddcc1a3..2e1cb2b 100644 --- a/sound/drivers/opl3/opl3_synth.c +++ b/sound/drivers/opl3/opl3_synth.c @@ -325,7 +325,7 @@ struct fm_patch *snd_opl3_find_patch(struct snd_opl3 *opl3, int prog, int bank, if (!create_patch) return NULL; - patch = kzalloc(sizeof(*patch), GFP_KERNEL); + patch = kzalloc(sizeof(*patch), GFP_ATOMIC); if (!patch) return NULL; patch->prog = prog; -- 1.7.9.5
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