pwm: lp3943: Fix potential memory leak during request

Fix a memory leak in the lp3943_pwm_request_map() error handling path.
Make sure already allocated pwm map memory is freed correctly.
Detected by Coverity: CID 1162829.

Signed-off-by: Christian Engelmayer <cengelma@gmx.at>
Acked-by: Milo Kim <milo.kim@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

diff --git a/drivers/pwm/pwm-lp3943.c b/drivers/pwm/pwm-lp3943.c
index 8a843a04c22456bb5c9856a92aba876c03beeca9..a40b9c34e9fffcd2bce08169cd7a256de067027f 100644 (file)
--- a/drivers/pwm/pwm-lp3943.c
+++ b/drivers/pwm/pwm-lp3943.c
@@ -52,8 +52,10 @@ lp3943_pwm_request_map(struct lp3943_pwm *lp3943_pwm, int hwpwm)
                offset = pwm_map->output[i];
 
                /* Return an error if the pin is already assigned */
-               if (test_and_set_bit(offset, &lp3943->pin_used))
+               if (test_and_set_bit(offset, &lp3943->pin_used)) {
+                       kfree(pwm_map);
                        return ERR_PTR(-EBUSY);
+               }
        }
 
        return pwm_map;