[PATCH v2] erofs-utils: s3: fix memory leak in s3erofs_create_object_iterator

[Nithurshen <nithurshen.dev@gmail.com>]

In s3erofs_create_object_iterator(), if the parsed prefix length
exceeds S3EROFS_PATH_MAX, the function aborts and returns an
-EINVAL error pointer. However, the 'iter' structure was already
allocated via calloc() and left unfreed, causing a memory leak.

This commit adds the missing free(iter) call in the error path to
prevent leaking memory when excessively long S3 bucket paths are
provided.

Signed-off-by: Nithurshen <nithurshen.dev@gmail.com>
---
 lib/remotes/s3.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/remotes/s3.c b/lib/remotes/s3.c
index 768232a..abfa5dc 100644
--- a/lib/remotes/s3.c
+++ b/lib/remotes/s3.c
@@ -911,8 +911,10 @@ s3erofs_create_object_iterator(struct erofs_s3 *s3, const char *path,
 		iter->bucket = NULL;
 		iter->prefix = strdup(path + 1);
 	} else {
-		if (++prefix - path > S3EROFS_PATH_MAX)
+		if (++prefix - path > S3EROFS_PATH_MAX) {
+			free(iter);
 			return ERR_PTR(-EINVAL);
+		}
 		iter->bucket = strndup(path, prefix - path);
 		iter->prefix = strdup(prefix);
 	}
-- 
2.52.0