From 8b450dcff23aa254844492831a8e2b508a9d522d Mon Sep 17 00:00:00 2001
From: Qiheng Lin <linqiheng@huawei.com>
Date: Thu, 8 Dec 2022 14:15:55 +0800
Subject: [PATCH] mfd: pcf50633-adc: Fix potential memleak in pcf50633_adc_async_read()
Git-commit: 8b450dcff23aa254844492831a8e2b508a9d522d
Patch-mainline: v6.3-rc1
References: git-fixes
`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: 08c3e06a5eb2 ("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
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/mfd/pcf50633-adc.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/mfd/pcf50633-adc.c b/drivers/mfd/pcf50633-adc.c
index 5cd653e61512..191b1bc6141c 100644
--- a/drivers/mfd/pcf50633-adc.c
+++ b/drivers/mfd/pcf50633-adc.c
@@ -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);
--
2.35.3