entry.c: convert checkout_entry to use strbuf

The old code does not do boundary check so any paths longer than
PATH_MAX can cause buffer overflow. Replace it with strbuf to handle
paths of arbitrary length.

The OS may reject if the path is too long though. But in that case we
report the cause (e.g. name too long) and usually move on to checking
out the next entry.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/entry.c b/entry.c
index acc892f9a62b5bc3d3442b044b29bf8d763bf3ba..fbb4863103417a408f11f9b5141b833915b2b211 100644 (file)
--- a/entry.c
+++ b/entry.c
@@ -237,16 +237,19 @@ static int check_path(const char *path, int len, struct stat *st, int skiplen)
 int checkout_entry(struct cache_entry *ce,
                   const struct checkout *state, char *topath)
 {
-       static char path[PATH_MAX + 1];
+       static struct strbuf path_buf = STRBUF_INIT;
+       char *path;
        struct stat st;
-       int len = state->base_dir_len;
+       int len;
 
        if (topath)
                return write_entry(ce, topath, state, 1);
 
-       memcpy(path, state->base_dir, len);
-       strcpy(path + len, ce->name);
-       len += ce_namelen(ce);
+       strbuf_reset(&path_buf);
+       strbuf_add(&path_buf, state->base_dir, state->base_dir_len);
+       strbuf_add(&path_buf, ce->name, ce_namelen(ce));
+       path = path_buf.buf;
+       len = path_buf.len;
 
        if (!check_path(path, len, &st, state->base_dir_len)) {
                unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);