[PATCH bpf-next 1/2] bpftool: fix double close in map dump

[chenyuan_fl@163.com]

From: Yuan Chen <chenyuan@kylinos.cn>

map_dump() closes the map fd in its error path, and do_dump() then
closes the same fd again after a successful dump. Closing an already
closed fd leaves errno set to EBADF, which poisons later errno checks
such as the batch file read check in do_batch(). Let do_dump() own the
fd and remove the close from map_dump().

Fixes: 99f9863a0c45f ("bpftool: Match maps by name")
Signed-off-by: Yuan Chen <chenyuan@kylinos.cn>
---
 tools/bpf/bpftool/map.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c
index 6b9649294ca1..e9f4dd9458cf 100644
--- a/tools/bpf/bpftool/map.c
+++ b/tools/bpf/bpftool/map.c
@@ -895,7 +895,6 @@ map_dump(int fd, struct bpf_map_info *info, json_writer_t *wtr,
 exit_free:
 	free(key);
 	free(value);
-	close(fd);
 	free_map_kv_btf(btf);
 
 	return err;
-- 
2.54.0