[PATCH 4.14 203/204] test_firmware: fix a memory leak with reqs buffer

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From: Mirsad Goran Todorovac <mirsad.todorovac@xxxxxxxxxxxx>

commit be37bed754ed90b2655382f93f9724b3c1aae847 upstream.

Dan Carpenter spotted that test_fw_config->reqs will be leaked if
trigger_batched_requests_store() is called two or more times.
The same appears with trigger_batched_requests_async_store().

This bug wasn't trigger by the tests, but observed by Dan's visual
inspection of the code.

The recommended workaround was to return -EBUSY if test_fw_config->reqs
is already allocated.

Fixes: 7feebfa487b92 ("test_firmware: add support for request_firmware_into_buf")
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Russ Weight <russell.h.weight@xxxxxxxxx>
Cc: Tianfei Zhang <tianfei.zhang@xxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Colin Ian King <colin.i.king@xxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: linux-kselftest@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx # v5.4
Suggested-by: Dan Carpenter <error27@xxxxxxxxx>
Suggested-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Mirsad Goran Todorovac <mirsad.todorovac@xxxxxxxxxxxx>
Reviewed-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Acked-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230509084746.48259-2-mirsad.todorovac@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 lib/test_firmware.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/lib/test_firmware.c
+++ b/lib/test_firmware.c
@@ -621,6 +621,11 @@ static ssize_t trigger_batched_requests_
 
 	mutex_lock(&test_fw_mutex);
 
+        if (test_fw_config->reqs) {
+                rc = -EBUSY;
+                goto out_bail;
+        }
+
 	test_fw_config->reqs = vzalloc(sizeof(struct test_batched_req) *
 				       test_fw_config->num_requests * 2);
 	if (!test_fw_config->reqs) {
@@ -723,6 +728,11 @@ ssize_t trigger_batched_requests_async_s
 
 	mutex_lock(&test_fw_mutex);
 
+        if (test_fw_config->reqs) {
+                rc = -EBUSY;
+                goto out_bail;
+        }
+
 	test_fw_config->reqs = vzalloc(sizeof(struct test_batched_req) *
 				       test_fw_config->num_requests * 2);
 	if (!test_fw_config->reqs) {





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