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Message-Id: <1433339435-3181-1-git-send-email-jack@suse.cz> Date: Wed, 3 Jun 2015 15:50:35 +0200 From: Jan Kara <jack@...e.cz> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: LKML <linux-kernel@...r.kernel.org>, Jan Kara <jack@...e.cz> Subject: [PATCH] lib: Clarify the return value of strnlen_user() strnlen_user() can return a number in a range 0 to count + sizeof(unsigned long) - 1. Clarify the comment at the top of the function so that users don't think the function returns at most count+1. Signed-off-by: Jan Kara <jack@...e.cz> --- lib/strnlen_user.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/lib/strnlen_user.c b/lib/strnlen_user.c index fd03ae980013..77bc67222b9d 100644 --- a/lib/strnlen_user.c +++ b/lib/strnlen_user.c @@ -89,7 +89,8 @@ static inline long do_strnlen_user(const char __user *src, unsigned long count, * Get the size of a NUL-terminated string in user space. * * Returns the size of the string INCLUDING the terminating NUL. - * If the string is too long, returns 'count+1'. + * If the string is too long, returns a number larger than @count. User + * has to check the return value against "> count". * On exception (or invalid count), returns 0. */ long strnlen_user(const char __user *str, long count) -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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