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mfd: pcf50633-adc: Fix potential memleak in pcf50633_adc_async_read() 

`req` is allocated in pcf50633_adc_async_read(), but
adc_enqueue_request() could fail to insert the `req` into queue.
We need to check the return value and free it in the case of failure.

Fixes: 08c3e06a5e ("mfd: PCF50633 adc driver")
Signed-off-by: Qiheng Lin <linqiheng@huawei.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20221208061555.8776-1-linqiheng@huawei.com
This commit is contained in:
Qiheng Lin 2022-12-08 14:15:55 +08:00 committed by Lee Jones
parent 3a8678dfa8
commit 8b450dcff2
1 changed files with 6 additions and 1 deletions
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7
drivers/mfd/pcf50633-adc.c
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@ -136,6 +136,7 @@ int pcf50633_adc_async_read(struct pcf50633 *pcf, int mux, int avg,
void *callback_param)
{
struct pcf50633_adc_request *req;
int ret;
/* req is freed when the result is ready, in interrupt handler */
req = kmalloc(sizeof(*req), GFP_KERNEL);
@ -147,7 +148,11 @@ int pcf50633_adc_async_read(struct pcf50633 *pcf, int mux, int avg,
req->callback = callback;
req->callback_param = callback_param;
return adc_enqueue_request(pcf, req);
ret = adc_enqueue_request(pcf, req);
if (ret)
kfree(req);
return ret;
}
EXPORT_SYMBOL_GPL(pcf50633_adc_async_read);