linux-kernel - [PATCH 4.9 009/101] ion: Make user_ion_handle_put

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Date:   Tue, 23 Aug 2022 10:02:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH 4.9 009/101] ion: Make user_ion_handle_put_nolock() a void function

From: Nathan Chancellor <nathan@...nel.org>

Clang warns:

  drivers/staging/android/ion/ion-ioctl.c:71:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
          if (--handle->user_ref_count == 0)
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  drivers/staging/android/ion/ion-ioctl.c:74:9: note: uninitialized use occurs here
          return ret;
                 ^~~
  drivers/staging/android/ion/ion-ioctl.c:71:2: note: remove the 'if' if its condition is always true
          if (--handle->user_ref_count == 0)
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  drivers/staging/android/ion/ion-ioctl.c:69:9: note: initialize the variable 'ret' to silence this warning
          int ret;
                 ^
                  = 0
  1 warning generated.

The return value of user_ion_handle_put_nolock() is not checked in its
one call site in user_ion_free_nolock() so just make
user_ion_handle_put_nolock() return void to remove the warning.

Fixes: a8200613c8c9 ("ion: Protect kref from userspace manipulation")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/android/ion/ion-ioctl.c |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

--- a/drivers/staging/android/ion/ion-ioctl.c
+++ b/drivers/staging/android/ion/ion-ioctl.c
@@ -64,14 +64,10 @@ static struct ion_handle *pass_to_user(s
 }
 
 /* Must hold the client lock */
-static int user_ion_handle_put_nolock(struct ion_handle *handle)
+static void user_ion_handle_put_nolock(struct ion_handle *handle)
 {
-	int ret;
-
 	if (--handle->user_ref_count == 0)
-		ret = ion_handle_put_nolock(handle);
-
-	return ret;
+		ion_handle_put_nolock(handle);
 }
 
 static void user_ion_free_nolock(struct ion_client *client,