[PATCH 1/2] entry.c: convert checkout_entry to use strbuf

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

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.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 To get this topic going again. These two patches kill PATH_MAX in
 entry.c and builtin/checkout-index.c

 entry.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/entry.c b/entry.c
index acc892f..d955af5 100644
--- a/entry.c
+++ b/entry.c
@@ -237,16 +237,18 @@ 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_addf(&path_buf, "%.*s%s", state->base_dir_len, state->base_dir, ce->name);
+	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);
-- 
1.8.2.83.gc99314b

-- 
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