[PATCH] mailbox: arm_mhuv2: Skip calling kfree() with invalid pointer

[Viresh Kumar]

It is possible that 'data' passed to kfree() is set to a error value
instead of allocated space. Make sure it doesn't get called with invalid
pointer.

Fixes: 5a6338cce9f4 ("mailbox: arm_mhuv2: Add driver")
Cc: v5.11 <sta...@vger.kernel.org> # v5.11
Reported-by: kernel test robot <l...@intel.com>
Reported-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Viresh Kumar <viresh.ku...@linaro.org>
---
 drivers/mailbox/arm_mhuv2.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mailbox/arm_mhuv2.c b/drivers/mailbox/arm_mhuv2.c
index cdfb1939fabf..d997f8ebfa98 100644
--- a/drivers/mailbox/arm_mhuv2.c
+++ b/drivers/mailbox/arm_mhuv2.c
@@ -699,7 +699,9 @@ static irqreturn_t mhuv2_receiver_interrupt(int irq, void 
*arg)
                ret = IRQ_HANDLED;
        }
 
-       kfree(data);
+       if (!IS_ERR(data))
+               kfree(data);
+
        return ret;
 }
 
-- 
2.25.0.rc1.19.g042ed3e048af