]> git.ipfire.org Git - thirdparty/kernel/stable.git/commitdiff
mfd: pcf50633-adc: Fix potential memleak in pcf50633_adc_async_read()
authorQiheng Lin <linqiheng@huawei.com>
Thu, 8 Dec 2022 06:15:55 +0000 (14:15 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 11 Mar 2023 15:26:39 +0000 (16:26 +0100)
[ Upstream commit 8b450dcff23aa254844492831a8e2b508a9d522d ]

`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
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/mfd/pcf50633-adc.c

index c1984b0d1b65273d64651f73e7f9c92fc0ef4e35..a4a765055ee6b38cdcac2955f76b54d6f0adf258 100644 (file)
@@ -140,6 +140,7 @@ 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);
@@ -151,7 +152,11 @@ 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);