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read-tree() and unpack_trees(): use consistent limit

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read-tree -m can read up to MAX_TREES, which was arbitrarily set to 8 since
August 2007 (4 is needed to deal with 2 merge-base case).

However, the updated unpack_trees() code had an advertised limit of 4
(which it enforced).  In reality the code was prepared to take only 3
trees and giving 4 caused it to stomp on its stack.  Rename the MAX_TREES
constant to MAX_UNPACK_TREES, move it to the unpack-trees.h common header
file, and use it from both places to avoid future confusion.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2008-03-13 22:07:18 -07:00
parent f746bae84e
commit ca885a4fe6
3 changed files with 9 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
builtin-read-tree.c
View File

@ -13,16 +13,15 @@
#include "dir.h"
#include "builtin.h"
#define MAX_TREES 8
static int nr_trees;
static struct tree *trees[MAX_TREES];
static struct tree *trees[MAX_UNPACK_TREES];
static int list_tree(unsigned char *sha1)
{
struct tree *tree;
if (nr_trees >= MAX_TREES)
die("I cannot read more than %d trees", MAX_TREES);
if (nr_trees >= MAX_UNPACK_TREES)
die("I cannot read more than %d trees", MAX_UNPACK_TREES);
tree = parse_tree_indirect(sha1);
if (!tree)
return -1;
@ -97,7 +96,7 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
{
int i, newfd, stage = 0;
unsigned char sha1[20];
struct tree_desc t[MAX_TREES];
struct tree_desc t[MAX_UNPACK_TREES];
struct unpack_trees_options opts;
memset(&opts, 0, sizeof(opts));

6
unpack-trees.c
View File

@ -123,7 +123,7 @@ static int unpack_index_entry(struct cache_entry *ce, struct unpack_trees_option
int traverse_trees_recursive(int n, unsigned long dirmask, unsigned long df_conflicts, struct name_entry *names, struct traverse_info *info)
{
int i;
struct tree_desc t[3];
struct tree_desc t[MAX_UNPACK_TREES];
struct traverse_info newinfo;
struct name_entry *p;
@ -327,8 +327,8 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
{
static struct cache_entry *dfc;
if (len > 4)
die("unpack_trees takes at most four trees");
if (len > MAX_UNPACK_TREES)
die("unpack_trees takes at most %d trees", MAX_UNPACK_TREES);
memset(&state, 0, sizeof(state));
state.base_dir = "";
state.force = 1;

2
unpack-trees.h
View File

@ -1,6 +1,8 @@
#ifndef UNPACK_TREES_H
#define UNPACK_TREES_H
#define MAX_UNPACK_TREES 8
struct unpack_trees_options;
typedef int (*merge_fn_t)(struct cache_entry **src,