From: Al Viro Date: Fri, 19 Aug 2016 01:16:49 +0000 (-0400) Subject: hexagon: fix strncpy_from_user() error return X-Git-Tag: v4.8-rc7~23^2~22 X-Git-Url: http://git.cascardo.info/?p=cascardo%2Flinux.git;a=commitdiff_plain;h=f35c1e0671728d1c9abc405d05ef548b5fcb2fc4 hexagon: fix strncpy_from_user() error return It's -EFAULT, not -1 (and contrary to the comment in there, __strnlen_user() can return 0 - on faults). Cc: stable@vger.kernel.org Acked-by: Richard Kuo Signed-off-by: Al Viro --- diff --git a/arch/hexagon/include/asm/uaccess.h b/arch/hexagon/include/asm/uaccess.h index f000a382bc7f..f61cfb28e9f2 100644 --- a/arch/hexagon/include/asm/uaccess.h +++ b/arch/hexagon/include/asm/uaccess.h @@ -103,7 +103,8 @@ static inline long hexagon_strncpy_from_user(char *dst, const char __user *src, { long res = __strnlen_user(src, n); - /* return from strnlen can't be zero -- that would be rubbish. */ + if (unlikely(!res)) + return -EFAULT; if (res > n) { copy_from_user(dst, src, n);