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bpf: Fix bad unlock balance on freeze_mutex 

Commit c4c84f6fb2 ("bpf: drop unnecessary bpf_capable() check in
BPF_MAP_FREEZE command") moved the permissions check outside of the
freeze_mutex in the map_freeze() handler. The error paths still jumps
to the err_put which tries to unlock the freeze_mutex even though it
was not locked in the first place. Fix it.

Fixes: c4c84f6fb2 ("bpf: drop unnecessary bpf_capable() check in BPF_MAP_FREEZE command")
Reported-by: syzbot+8982e75c2878b9ffeac5@syzkaller.appspotmail.com
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Daniel Borkmann 2023-05-26 12:13:56 +02:00
parent 4aadd2920b
commit 4266f41fea
1 changed files with 2 additions and 2 deletions
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4
kernel/bpf/syscall.c
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@ -1932,8 +1932,8 @@ static int map_freeze(const union bpf_attr *attr)
}
if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
err = -EPERM;
goto err_put;
fdput(f);
return -EPERM;
}
mutex_lock(&map->freeze_mutex);