Commit ecb63a1b authored Feb 15, 2016 by Andrzej Hajda Committed by Greg Kroah-Hartman Mar 05, 2016

drivers: char: mem: fix IS_ERROR_VALUE usage

IS_ERR_VALUE macro should be used only with unsigned long type.
Specifically it works incorrectly with longer types.

The patch follows conclusion from discussion on LKML [1][2].

[1]: http://permalink.gmane.org/gmane.linux.kernel/2120927
[2]: http://permalink.gmane.org/gmane.linux.kernel/2150581



Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent ba327173

drivers/char/mem.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -695,7 +695,7 @@ static loff_t memory_lseek(struct file *file, loff_t offset, int orig)
		offset += file->f_pos;
		case SEEK_SET:
		/* to avoid userland mistaking f_pos=-9 as -EBADF=-9 */
		if (IS_ERR_VALUE((unsigned long long)offset)) {
		if ((unsigned long long)offset >= -MAX_ERRNO) {
		ret = -EOVERFLOW;
		break;
		}