diff mbox series

[bpf-next,v9,03/23] bpf: Free inner_map_meta when btf_record_dup fails

Message ID 20221117225510.1676785-4-memxor@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Allocated objects, BPF linked lists | expand

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netdev/cc_maintainers warning 8 maintainers not CCed: sdf@google.com kpsingh@kernel.org haoluo@google.com yhs@fb.com jolsa@kernel.org martin.lau@linux.dev song@kernel.org john.fastabend@gmail.com
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Commit Message

Kumar Kartikeya Dwivedi Nov. 17, 2022, 10:54 p.m. UTC 
Whenever btf_record_dup fails, we must free inner_map_meta that was
allocated before.

This fixes a memory leak (in case of errors) during inner map creation.

Fixes: aa3496accc41 ("bpf: Refactor kptr_off_tab into btf_record")
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 kernel/bpf/map_in_map.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/bpf/map_in_map.c b/kernel/bpf/map_in_map.c
index 8ca0cca39d49..a423130a8720 100644
--- a/kernel/bpf/map_in_map.c
+++ b/kernel/bpf/map_in_map.c
@@ -52,12 +52,14 @@  struct bpf_map *bpf_map_meta_alloc(int inner_map_ufd)
 	inner_map_meta->max_entries = inner_map->max_entries;
 	inner_map_meta->record = btf_record_dup(inner_map->record);
 	if (IS_ERR(inner_map_meta->record)) {
+		struct bpf_map *err_ptr = ERR_CAST(inner_map_meta->record);
 		/* btf_record_dup returns NULL or valid pointer in case of
 		 * invalid/empty/valid, but ERR_PTR in case of errors. During
 		 * equality NULL or IS_ERR is equivalent.
 		 */
+		kfree(inner_map_meta);
 		fdput(f);
-		return ERR_CAST(inner_map_meta->record);
+		return err_ptr;
 	}
 	if (inner_map->btf) {
 		btf_get(inner_map->btf);