pack-objects: fix off-by-one in delta-island tree-depth computation

diff --git a/builtin/update-index.c b/builtin/update-index.c
index a8709a26ec4b8bb79cbb20bfa4a7892e063c804d..f5c0b6a1d23b203de5379cf898b70679857683ff 100644 (file)
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -268,15 +268,14 @@ static int process_lstat_error(const char *path, int err)
 
 static int add_one_path(const struct cache_entry *old, const char *path, int len, struct stat *st)
 {
-       int option, size;
+       int option;
        struct cache_entry *ce;
 
        /* Was the old index entry already up-to-date? */
        if (old && !ce_stage(old) && !ce_match_stat(old, st, 0))
                return 0;
 
-       size = cache_entry_size(len);
-       ce = xcalloc(1, size);
+       ce = make_empty_cache_entry(&the_index, len);
        memcpy(ce->name, path, len);
        ce->ce_flags = create_ce_flags(0);
        ce->ce_namelen = len;
@@ -285,13 +284,13 @@ static int add_one_path(const struct cache_entry *old, const char *path, int len
 
        if (index_path(&ce->oid, path, st,
                       info_only ? 0 : HASH_WRITE_OBJECT)) {
-               free(ce);
+               discard_cache_entry(ce);
                return -1;
        }
        option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
        option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
        if (add_cache_entry(ce, option)) {
-               free(ce);
+               discard_cache_entry(ce);
                return error("%s: cannot add to the index - missing --add option?", path);
        }
        return 0;
@@ -402,15 +401,14 @@ static int process_path(const char *path, struct stat *st, int stat_errno)
 static int add_cacheinfo(unsigned int mode, const struct object_id *oid,
                         const char *path, int stage)
 {
-       int size, len, option;
+       int len, option;
        struct cache_entry *ce;
 
        if (!verify_path(path, mode))
                return error("Invalid path '%s'", path);
 
        len = strlen(path);
-       size = cache_entry_size(len);
-       ce = xcalloc(1, size);
+       ce = make_empty_cache_entry(&the_index, len);
 
        oidcpy(&ce->oid, oid);
        memcpy(ce->name, path, len);
@@ -492,6 +490,7 @@ static void update_one(const char *path)
 
 static void read_index_info(int nul_term_line)
 {
+       const int hexsz = the_hash_algo->hexsz;
        struct strbuf buf = STRBUF_INIT;
        struct strbuf uq = STRBUF_INIT;
        strbuf_getline_fn getline_fn;
@@ -529,7 +528,7 @@ static void read_index_info(int nul_term_line)
                mode = ul;
 
                tab = strchr(ptr, '\t');
-               if (!tab || tab - ptr < GIT_SHA1_HEXSZ + 1)
+               if (!tab || tab - ptr < hexsz + 1)
                        goto bad_line;
 
                if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
@@ -542,8 +541,8 @@ static void read_index_info(int nul_term_line)
                        ptr = tab + 1; /* point at the head of path */
                }
 
-               if (get_oid_hex(tab - GIT_SHA1_HEXSZ, &oid) ||
-                       tab[-(GIT_SHA1_HEXSZ + 1)] != ' ')
+               if (get_oid_hex(tab - hexsz, &oid) ||
+                       tab[-(hexsz + 1)] != ' ')
                        goto bad_line;
 
                path_name = ptr;
@@ -571,7 +570,7 @@ static void read_index_info(int nul_term_line)
                         * ptr[-1] points at tab,
                         * ptr[-41] is at the beginning of sha1
                         */
-                       ptr[-(GIT_SHA1_HEXSZ + 2)] = ptr[-1] = 0;
+                       ptr[-(hexsz + 2)] = ptr[-1] = 0;
                        if (add_cacheinfo(mode, &oid, path_name, stage))
                                die("git update-index: unable to update %s",
                                    path_name);
@@ -599,7 +598,6 @@ static struct cache_entry *read_one_ent(const char *which,
 {
        unsigned mode;
        struct object_id oid;
-       int size;
        struct cache_entry *ce;
 
        if (get_tree_entry(ent, path, &oid, &mode)) {
@@ -612,8 +610,7 @@ static struct cache_entry *read_one_ent(const char *which,
                        error("%s: not a blob in %s branch.", path, which);
                return NULL;
        }
-       size = cache_entry_size(namelen);
-       ce = xcalloc(1, size);
+       ce = make_empty_cache_entry(&the_index, namelen);
 
        oidcpy(&ce->oid, &oid);
        memcpy(ce->name, path, namelen);
@@ -690,8 +687,8 @@ static int unresolve_one(const char *path)
        error("%s: cannot add their version to the index.", path);
        ret = -1;
  free_return:
-       free(ce_2);
-       free(ce_3);
+       discard_cache_entry(ce_2);
+       discard_cache_entry(ce_3);
        return ret;
 }
 
@@ -758,7 +755,7 @@ static int do_reupdate(int ac, const char **av,
                                           ce->name, ce_namelen(ce), 0);
                if (old && ce->ce_mode == old->ce_mode &&
                    !oidcmp(&ce->oid, &old->oid)) {
-                       free(old);
+                       discard_cache_entry(old);
                        continue; /* unchanged */
                }
                /* Be careful.  The working tree may not have the
@@ -769,7 +766,7 @@ static int do_reupdate(int ac, const char **av,
                path = xstrdup(ce->name);
                update_one(path);
                free(path);
-               free(old);
+               discard_cache_entry(old);
                if (save_nr != active_nr)
                        goto redo;
        }
@@ -826,6 +823,7 @@ static int parse_new_style_cacheinfo(const char *arg,
 {
        unsigned long ul;
        char *endp;
+       const char *p;
 
        if (!arg)
                return -1;
@@ -836,9 +834,9 @@ static int parse_new_style_cacheinfo(const char *arg,
                return -1; /* not a new-style cacheinfo */
        *mode = ul;
        endp++;
-       if (get_oid_hex(endp, oid) || endp[GIT_SHA1_HEXSZ] != ',')
+       if (parse_oid_hex(endp, oid, &p) || *p != ',')
                return -1;
-       *path = endp + GIT_SHA1_HEXSZ + 1;
+       *path = p + 1;
        return 0;
 }