diff --cc: integer overflow given a 2GB-or-larger file

Few of us use git to compare or even version-control 2GB files,
but when we do, we'll want it to work.

Reading a recent patch, I noticed two lines like this:

   int len = st.st_size;

Instead of "int", that should be "size_t".  Otherwise, in the
non-symlink case, with 64-bit size_t, if the file's size is 2GB,
the following xmalloc will fail:

   result = xmalloc(len + 1);

trying to allocate 2^64 - 2^31 + 1 bytes (assuming sign-extension
in the int-to-size_t promotion).  And even if it didn't fail, the
subsequent "result[len] = 0;" would be equivalent to an unpleasant
"result[-2147483648] = 0;"

The other nearby "int"-declared size variable, sz, should also be of
type size_t, for the same reason.  If sz ever wraps around and becomes
negative, xread will corrupt memory _before_ the "result" buffer.

Signed-off-by: Jim Meyering <jim@meyering.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

combine-diff.c

@@ -684,7 +684,7 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
 			goto deleted_file;
 
 		if (S_ISLNK(st.st_mode)) {
-			int len = st.st_size;
+			size_t len = st.st_size;
 			result_size = len;
 			result = xmalloc(len + 1);
 			if (result_size != readlink(elem->path, result, len)) {
@@ -697,8 +697,8 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
 		}
 		else if (0 <= (fd = open(elem->path, O_RDONLY)) &&
 			 !fstat(fd, &st)) {
-			int len = st.st_size;
-			int sz = 0;
+			size_t len = st.st_size;
+			size_t sz = 0;
 
 			elem->mode = canon_mode(st.st_mode);
 			result_size = len;