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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>
This commit is contained in:
Andrzej Hajda 2016-02-15 15:35:21 +01:00 committed by Greg Kroah-Hartman
parent ba327173ef
commit ecb63a1b64
1 changed files with 1 additions and 1 deletions
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2
drivers/char/mem.c
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@ -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;
}