cmd_clean() had the following code structure:
struct strbuf abs_path = STRBUF_INIT;
for_each_string_list_item(item, &del_list) {
strbuf_addstr(&abs_path, prefix);
strbuf_addstr(&abs_path, item->string);
PROCESS(&abs_path);
strbuf_reset(&abs_path);
}
where I've elided a bunch of unnecessary details and PROCESS(&abs_path)
represents a big chunk of code rather than an actual function call. One
piece of PROCESS was:
if (lstat(abs_path.buf, &st))
continue;
which would cause the strbuf_reset() to be missed -- meaning that the
next path to be handled would have two paths concatenated. This path
used to use die_errno() instead of continue prior to commit 396049e5fb62
("git-clean: refactor git-clean into two phases", 2013-06-25), but my
understanding of how correct_untracked_entries() works is that it will
prevent both dir/ and dir/file from being in the list to clean so this
should be dead code and the die_errno() should be safe. But I hesitate
to remove it since I am not certain.
However, we can fix both this bug and possible similar future bugs by
simply moving the strbuf_reset(&abs_path) to the beginning of the loop.
It'll result in N calls to strbuf_reset() instead of N-1, but that's a
small price to pay to avoid sneaky bugs like this.
Signed-off-by: Elijah Newren <newren@xxxxxxxxx>
---
builtin/clean.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/builtin/clean.c b/builtin/clean.c
index 6030842f3a..4cf2399f59 100644
--- a/builtin/clean.c
+++ b/builtin/clean.c
@@ -1018,6 +1018,7 @@ int cmd_clean(int argc, const char **argv, const char *prefix)
for_each_string_list_item(item, &del_list) {
struct stat st;
+ strbuf_reset(&abs_path);
if (prefix)
strbuf_addstr(&abs_path, prefix);
@@ -1051,7 +1052,6 @@ int cmd_clean(int argc, const char **argv, const char *prefix)
printf(dry_run ? _(msg_would_remove) : _(msg_remove), qname);
}
}
- strbuf_reset(&abs_path);
}
strbuf_release(&abs_path);
--
2.22.1.17.g6e632477f7.dirty
