dmaengine: idxd: fix uninit var for alt_drv

0-day detected uninitialized alt_drv variable in the bind_store() function.
The branch can be taken when device is not idxd device or wq 'struct
device'. Init alt_drv to NULL.

Fixes: 6e7f3ee97bbe ("dmaengine: idxd: move dsa_drv support to compatible mode")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162689250332.2114335.636367120454420852.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/idxd/compat.c b/drivers/dma/idxd/compat.c
index d67746ee0c1a4a26ee54477543b5bc87a36d35a0..d7616c240dcd41be44883ff37f45eefa3eb8bae6 100644 (file)
--- a/drivers/dma/idxd/compat.c
+++ b/drivers/dma/idxd/compat.c
@@ -34,7 +34,7 @@ static ssize_t bind_store(struct device_driver *drv, const char *buf, size_t cou
 {
        struct bus_type *bus = drv->bus;
        struct device *dev;
-       struct device_driver *alt_drv;
+       struct device_driver *alt_drv = NULL;
        int rc = -ENODEV;
        struct idxd_dev *idxd_dev;