Merge branch 'akpm' (patches from Andrew)

Merge more updates from Andrew Morton:

 - almost all of the rest of -mm

 - various other subsystems

Subsystems affected by this patch series:
  memcg, misc, core-kernel, lib, checkpatch, reiserfs, fat, fork,
  cpumask, kexec, uaccess, kconfig, kgdb, bug, ipc, lzo, kasan, madvise,
  cleanups, pagemap

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (77 commits)
  arch/sparc/include/asm/pgtable_64.h: fix build
  mm: treewide: clarify pgtable_page_{ctor,dtor}() naming
  ntfs: remove (un)?likely() from IS_ERR() conditions
  IB/hfi1: remove unlikely() from IS_ERR*() condition
  xfs: remove unlikely() from WARN_ON() condition
  wimax/i2400m: remove unlikely() from WARN*() condition
  fs: remove unlikely() from WARN_ON() condition
  xen/events: remove unlikely() from WARN() condition
  checkpatch: check for nested (un)?likely() calls
  hexagon: drop empty and unused free_initrd_mem
  mm: factor out common parts between MADV_COLD and MADV_PAGEOUT
  mm: introduce MADV_PAGEOUT
  mm: change PAGEREF_RECLAIM_CLEAN with PAGE_REFRECLAIM
  mm: introduce MADV_COLD
  mm: untag user pointers in mmap/munmap/mremap/brk
  vfio/type1: untag user pointers in vaddr_get_pfn
  tee/shm: untag user pointers in tee_shm_register
  media/v4l2-core: untag user pointers in videobuf_dma_contig_user_get
  drm/radeon: untag user pointers in radeon_gem_userptr_ioctl
  drm/amdgpu: untag user pointers
  ...

1 files changed, 7 insertions, 5 deletions

diff --git a/lib/string.c b/lib/string.c
index 461fb620f85f..cd7a10c19210 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -173,8 +173,9 @@ EXPORT_SYMBOL(strlcpy);
  * doesn't unnecessarily force the tail of the destination buffer to be
  * zeroed.  If zeroing is desired please use strscpy_pad().
  *
- * Return: The number of characters copied (not including the trailing
- *         %NUL) or -E2BIG if the destination buffer wasn't big enough.
+ * Returns:
+ * * The number of characters copied (not including the trailing %NUL)
+ * * -E2BIG if count is 0 or @src was truncated.
  */
 ssize_t strscpy(char *dest, const char *src, size_t count)
 {
@@ -182,7 +183,7 @@ ssize_t strscpy(char *dest, const char *src, size_t count)
         size_t max = count;
         long res = 0;
 
-        if (count == 0)
+        if (count == 0 || WARN_ON_ONCE(count > INT_MAX))
                 return -E2BIG;
 
 #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
@@ -253,8 +254,9 @@ EXPORT_SYMBOL(strscpy);
  * For full explanation of why you may want to consider using the
  * 'strscpy' functions please see the function docstring for strscpy().
  *
- * Return: The number of characters copied (not including the trailing
- *         %NUL) or -E2BIG if the destination buffer wasn't big enough.
+ * Returns:
+ * * The number of characters copied (not including the trailing %NUL)
+ * * -E2BIG if count is 0 or @src was truncated.
  */
 ssize_t strscpy_pad(char *dest, const char *src, size_t count)
 {