Merge tag 'v4.7-rc2' into v4l_for_linus

Linux 4.7-rc2

* tag 'v4.7-rc2': (10914 commits)
  Linux 4.7-rc2
  devpts: Make each mount of devpts an independent filesystem.
  parisc: Move die_if_kernel() prototype into traps.h header
  parisc: Fix pagefault crash in unaligned __get_user() call
  parisc: Fix printk time during boot
  parisc: Fix backtrace on PA-RISC
  mm, page_alloc: recalculate the preferred zoneref if the context can ignore memory policies
  mm, page_alloc: reset zonelist iterator after resetting fair zone allocation policy
  mm, oom_reaper: do not use siglock in try_oom_reaper()
  mm, page_alloc: prevent infinite loop in buffered_rmqueue()
  checkpatch: reduce git commit description style false positives
  mm/z3fold.c: avoid modifying HEADLESS page and minor cleanup
  memcg: add RCU locking around css_for_each_descendant_pre() in memcg_offline_kmem()
  mm: check the return value of lookup_page_ext for all call sites
  kdump: fix dmesg gdbmacro to work with record based printk
  mm: fix overflow in vm_map_ram()
  Btrfs: deal with duplciates during extent_map insertion in btrfs_get_extent
  arm64: fix alignment when RANDOMIZE_TEXT_OFFSET is enabled
  arm64: move {PAGE,CONT}_SHIFT into Kconfig
  arm64: mm: dump: log span level
  ...

1 files changed, 7 insertions, 16 deletions

diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
index 10a1d7dc9313..6eb99c17dbd8 100644
--- a/kernel/sysctl_binary.c
+++ b/kernel/sysctl_binary.c
@@ -13,6 +13,7 @@
 #include <linux/ctype.h>
 #include <linux/netdevice.h>
 #include <linux/kernel.h>
+#include <linux/uuid.h>
 #include <linux/slab.h>
 #include <linux/compat.h>
 
@@ -1117,9 +1118,8 @@ static ssize_t bin_uuid(struct file *file,
 
 	/* Only supports reads */
 	if (oldval && oldlen) {
-		char buf[40], *str = buf;
-		unsigned char uuid[16];
-		int i;
+		char buf[UUID_STRING_LEN + 1];
+		uuid_be uuid;
 
 		result = kernel_read(file, 0, buf, sizeof(buf) - 1);
 		if (result < 0)
@@ -1127,24 +1127,15 @@ static ssize_t bin_uuid(struct file *file,
 
 		buf[result] = '\0';
 
-		/* Convert the uuid to from a string to binary */
-		for (i = 0; i < 16; i++) {
-			result = -EIO;
-			if (!isxdigit(str[0]) || !isxdigit(str[1]))
-				goto out;
-
-			uuid[i] = (hex_to_bin(str[0]) << 4) |
-					hex_to_bin(str[1]);
-			str += 2;
-			if (*str == '-')
-				str++;
-		}
+		result = -EIO;
+		if (uuid_be_to_bin(buf, &uuid))
+			goto out;
 
 		if (oldlen > 16)
 			oldlen = 16;
 
 		result = -EFAULT;
-		if (copy_to_user(oldval, uuid, oldlen))
+		if (copy_to_user(oldval, &uuid, oldlen))
 			goto out;
 
 		copied = oldlen;