Merge branch 'maint'

* maint:
  pack-check.c::verify_packfile(): don't run SHA-1 update on huge data
  Fix infinite loop when deleting multiple packed refs.

cache.h

@@ -179,6 +179,7 @@ extern int refresh_cache(unsigned int flags);
 
 struct lock_file {
 	struct lock_file *next;
+	char on_list;
 	char filename[PATH_MAX];
 };
 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);

lockfile.c

@@ -27,9 +27,12 @@ static int lock_file(struct lock_file *lk, const char *path)
 	sprintf(lk->filename, "%s.lock", path);
 	fd = open(lk->filename, O_RDWR | O_CREAT | O_EXCL, 0666);
 	if (0 <= fd) {
-		if (!lk->next) {
+		if (!lk->on_list) {
 			lk->next = lock_file_list;
 			lock_file_list = lk;
+			lk->on_list = 1;
+		}
+		if (lock_file_list) {
 			signal(SIGINT, remove_lock_file_on_signal);
 			atexit(remove_lock_file);
 		}
@@ -37,6 +40,8 @@ static int lock_file(struct lock_file *lk, const char *path)
 			return error("cannot fix permission bits on %s",
 				     lk->filename);
 	}
+	else
+		lk->filename[0] = 0;
 	return fd;
 }
 

pack-check.c

@@ -1,16 +1,18 @@
 #include "cache.h"
 #include "pack.h"
 
+#define BATCH (1u<<20)
+
 static int verify_packfile(struct packed_git *p)
 {
 	unsigned long index_size = p->index_size;
 	void *index_base = p->index_base;
 	SHA_CTX ctx;
 	unsigned char sha1[20];
-	unsigned long pack_size = p->pack_size;
-	void *pack_base;
 	struct pack_header *hdr;
 	int nr_objects, err, i;
+	unsigned char *packdata;
+	unsigned long datasize;
 
 	/* Header consistency check */
 	hdr = p->pack_base;
@@ -25,11 +27,19 @@ static int verify_packfile(struct packed_git *p)
 			     "while idx size expects %d", nr_objects,
 			     num_packed_objects(p));
 
+	/* Check integrity of pack data with its SHA-1 checksum */
 	SHA1_Init(&ctx);
-	pack_base = p->pack_base;
-	SHA1_Update(&ctx, pack_base, pack_size - 20);
+	packdata = p->pack_base;
+	datasize = p->pack_size - 20;
+	while (datasize) {
+		unsigned long batch = (datasize < BATCH) ? datasize : BATCH;
+		SHA1_Update(&ctx, packdata, batch);
+		datasize -= batch;
+		packdata += batch;
+	}
 	SHA1_Final(sha1, &ctx);
-	if (hashcmp(sha1, (unsigned char *)pack_base + pack_size - 20))
+
+	if (hashcmp(sha1, (unsigned char *)(p->pack_base) + p->pack_size - 20))
 		return error("Packfile %s SHA1 mismatch with itself",
 			     p->pack_name);
 	if (hashcmp(sha1, (unsigned char *)index_base + index_size - 40))

refs.c

@@ -726,7 +726,6 @@ static int repack_without_ref(const char *refname)
 	}
 	if (!found)
 		return 0;
-	memset(&packlock, 0, sizeof(packlock));
 	fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
 	if (fd < 0)
 		return error("cannot delete '%s' from packed refs", refname);