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test_firmware: fix a memory leak with reqs buffer 

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: 7feebfa487 ("test_firmware: add support for request_firmware_into_buf")
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Russ Weight <russell.h.weight@intel.com>
Cc: Tianfei Zhang <tianfei.zhang@intel.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Colin Ian King <colin.i.king@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: linux-kselftest@vger.kernel.org
Cc: stable@vger.kernel.org # v5.4
Suggested-by: Dan Carpenter <error27@gmail.com>
Suggested-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/20230509084746.48259-2-mirsad.todorovac@alu.unizg.hr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mirsad Goran Todorovac 2023-05-09 10:47:47 +02:00 committed by Greg Kroah-Hartman
parent 4acfe3dfde
commit be37bed754
1 changed files with 10 additions and 0 deletions
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10
lib/test_firmware.c
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@ -913,6 +913,11 @@ static ssize_t trigger_batched_requests_store(struct device *dev,
mutex_lock(&test_fw_mutex);
if (test_fw_config->reqs) {
rc = -EBUSY;
goto out_bail;
}
test_fw_config->reqs =
vzalloc(array3_size(sizeof(struct test_batched_req),
test_fw_config->num_requests, 2));
@ -1011,6 +1016,11 @@ ssize_t trigger_batched_requests_async_store(struct device *dev,
mutex_lock(&test_fw_mutex);
if (test_fw_config->reqs) {
rc = -EBUSY;
goto out_bail;
}
test_fw_config->reqs =
vzalloc(array3_size(sizeof(struct test_batched_req),
test_fw_config->num_requests, 2));