[PATCH] ELF: use __builtin_mul_overflow() more

[Alexey Dobriyan]

__builtin_mul_overflow() can do multiplication and overflow check
in one line.

Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---

 fs/binfmt_elf.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1651,9 +1651,8 @@ static int fill_files_note(struct memelfnote *note, struct coredump_params *cprm
 
 	/* *Estimated* file count and total data size needed */
 	count = cprm->vma_count;
-	if (count > UINT_MAX / 64)
+	if (__builtin_mul_overflow(count, 64, &size))
 		return -EINVAL;
-	size = count * 64;
 
 	names_ofs = (2 + 3 * count) * sizeof(data[0]);
  alloc: