linux-kernel - [PATCH 2/4] fs: move timespec validation into utimes

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Date:   Wed, 15 Jul 2020 08:54:32 +0200
From:   Christoph Hellwig <hch@....de>
To:     Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] fs: move timespec validation into utimes_common

Consolidate the validation of the timespec from the two callers into
utimes_common.  That means it is done a little later (e.g. after the
path lookup), but I can't find anything that requires a specific
order of processing the errors.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/utimes.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/fs/utimes.c b/fs/utimes.c
index c667517b6eb110..441c7fb54053ca 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -27,9 +27,14 @@ static int utimes_common(const struct path *path, struct timespec64 *times)
 	if (error)
 		goto out;
 
-	if (times && times[0].tv_nsec == UTIME_NOW &&
-		     times[1].tv_nsec == UTIME_NOW)
-		times = NULL;
+	if (times) {
+		if (!nsec_valid(times[0].tv_nsec) ||
+		    !nsec_valid(times[1].tv_nsec))
+			return -EINVAL;
+		if (times[0].tv_nsec == UTIME_NOW &&
+		    times[1].tv_nsec == UTIME_NOW)
+			times = NULL;
+	}
 
 	newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
 	if (times) {
@@ -76,9 +81,6 @@ static int do_utimes_path(int dfd, const char __user *filename,
 	struct path path;
 	int lookup_flags = 0, error;
 
-	if (times &&
-	    (!nsec_valid(times[0].tv_nsec) || !nsec_valid(times[1].tv_nsec)))
-		return -EINVAL;
 	if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH))
 		return -EINVAL;
 
@@ -107,9 +109,6 @@ static int do_utimes_fd(int fd, struct timespec64 *times, int flags)
 	struct fd f;
 	int error;
 
-	if (times &&
-	    (!nsec_valid(times[0].tv_nsec) || !nsec_valid(times[1].tv_nsec)))
-		return -EINVAL;
 	if (flags)
 		return -EINVAL;
 
-- 
2.27.0