Merge branch 'jk/tighten-alloc' into maint

* jk/tighten-alloc: (23 commits)
  compat/mingw: brown paper bag fix for 50a6c8e
  ewah: convert to REALLOC_ARRAY, etc
  convert ewah/bitmap code to use xmalloc
  diff_populate_gitlink: use a strbuf
  transport_anonymize_url: use xstrfmt
  git-compat-util: drop mempcpy compat code
  sequencer: simplify memory allocation of get_message
  test-path-utils: fix normalize_path_copy output buffer size
  fetch-pack: simplify add_sought_entry
  fast-import: simplify allocation in start_packfile
  write_untracked_extension: use FLEX_ALLOC helper
  prepare_{git,shell}_cmd: use argv_array
  use st_add and st_mult for allocation size computation
  convert trivial cases to FLEX_ARRAY macros
  use xmallocz to avoid size arithmetic
  convert trivial cases to ALLOC_ARRAY
  convert manual allocations to argv_array
  argv-array: add detach function
  add helpers for allocating flex-array structs
  harden REALLOC_ARRAY and xcalloc against size_t overflow
  ...

1 files changed, 4 insertions, 2 deletions

diff --git a/diffcore-delta.c b/diffcore-delta.c
index 7cf431d26..4159748a7 100644
--- a/diffcore-delta.c
+++ b/diffcore-delta.c
@@ -53,7 +53,8 @@ static struct spanhash_top *spanhash_rehash(struct spanhash_top *orig)
 	int osz = 1 << orig->alloc_log2;
 	int sz = osz << 1;
 
-	new = xmalloc(sizeof(*orig) + sizeof(struct spanhash) * sz);
+	new = xmalloc(st_add(sizeof(*orig),
+			     st_mult(sizeof(struct spanhash), sz)));
 	new->alloc_log2 = orig->alloc_log2 + 1;
 	new->free = INITIAL_FREE(new->alloc_log2);
 	memset(new->data, 0, sizeof(struct spanhash) * sz);
@@ -130,7 +131,8 @@ static struct spanhash_top *hash_chars(struct diff_filespec *one)
 	int is_text = !diff_filespec_is_binary(one);
 
 	i = INITIAL_HASH_SIZE;
-	hash = xmalloc(sizeof(*hash) + sizeof(struct spanhash) * (1<<i));
+	hash = xmalloc(st_add(sizeof(*hash),
+			      st_mult(sizeof(struct spanhash), 1<<i)));
 	hash->alloc_log2 = i;
 	hash->free = INITIAL_FREE(i);
 	memset(hash->data, 0, sizeof(struct spanhash) * (1<<i));