X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Futimes.c;h=e5588cd8530e1b7b751bb2a459ac51fdcd3498aa;hb=19e66a67e9b25874cd5e184e7d381ce1b955df11;hp=682eb63b20ad3c4c7452870c3d9e6e832aea21e0;hpb=fd2f261053b2f125d5f6882b6d095ce2f4076fe5;p=linux-2.6

diff --git a/fs/utimes.c b/fs/utimes.c
index 682eb63b20..e5588cd853 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -6,6 +6,7 @@
 #include <linux/sched.h>
 #include <linux/stat.h>
 #include <linux/utime.h>
+#include <linux/syscalls.h>
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
 
@@ -38,6 +39,14 @@ asmlinkage long sys_utime(char __user *filename, struct utimbuf __user *times)
 
 #endif
 
+static bool nsec_valid(long nsec)
+{
+	if (nsec == UTIME_OMIT || nsec == UTIME_NOW)
+		return true;
+
+	return nsec >= 0 && nsec <= 999999999;
+}
+
 /* If times==NULL, set access and modification to current time,
  * must be owner or have write permission.
  * Else, update from *times, must be owner or super user.
@@ -52,6 +61,11 @@ long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags
 	struct file *f = NULL;
 
 	error = -EINVAL;
+	if (times && (!nsec_valid(times[0].tv_nsec) ||
+		      !nsec_valid(times[1].tv_nsec))) {
+		goto out;
+	}
+
 	if (flags & ~AT_SYMLINK_NOFOLLOW)
 		goto out;