bpf: Fix exclusive map memory leak

Browse source

When excl_prog_hash is 0 and excl_prog_hash_size is non-zero, the map also
needs to be freed. Otherwise, the map memory will not be reclaimed, just
like the memory leak problem reported by syzbot [1].

syzbot reported:
BUG: memory leak
  backtrace (crc 7b9fb9b4):
    map_create+0x322/0x11e0 kernel/bpf/syscall.c:1512
    __sys_bpf+0x3556/0x3610 kernel/bpf/syscall.c:6131

Fixes: baefdbdf68 ("bpf: Implement exclusive map creation")
Reported-by: syzbot+cf08c551fecea9fd1320@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=cf08c551fecea9fd1320
Tested-by: syzbot+cf08c551fecea9fd1320@syzkaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/tencent_3F226F882CE56DCC94ACE90EED1ECCFC780A@qq.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

...

This commit is contained in:

Edward Adam Davis 2025-11-16 22:58:13 +08:00 • committed by Alexei Starovoitov

parent 5262cb2339

commit 688b745401

1 changed files with 2 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

3

kernel/bpf/syscall.c

View file