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 stable@vger.kernel.org # v5.11 Reported-by: kernel test robot lkp@intel.com Reported-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Viresh Kumar viresh.kumar@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; }