[ 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 triggered 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: c92316bf8e94 ("test_firmware: add batched firmware tests") 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 # v4.14 Suggested-by: Dan Carpenter error27@gmail.com Suggested-by: Takashi Iwai tiwai@suse.de Link: https://lore.kernel.org/r/20230509084746.48259-2-mirsad.todorovac@alu.unizg.... Signed-off-by: Mirsad Todorovac mirsad.todorovac@alu.unizg.hr

[ This fix is applied against the 4.14 stable branch. There are no changes to the ] [ fix in code when compared to the upstread, only the reformatting for backport. ]

Signed-off-by: Mirsad Todorovac mirsad.todorovac@alu.unizg.hr --- v1 -> v2: removed the Reviewed-by: and Acked-by tags, as this is a slightly different patch and those need to be reacquired

lib/test_firmware.c | 10 ++++++++++ 1 file changed, 10 insertions(+)

diff --git a/lib/test_firmware.c b/lib/test_firmware.c index 1c5e5246bf10..5318c5e18acf 100644 --- a/lib/test_firmware.c +++ b/lib/test_firmware.c @@ -621,6 +621,11 @@ 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(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_store(struct device *dev,

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) {