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bpf: don't indicate success when copy_from_user fails 

err in bpf_prog_get_info_by_fd() still holds 0 at that time from prior
check_uarg_tail_zero() check. Explicitly return -EFAULT instead, so
user space can be notified of buggy behavior.

Fixes: 1e27097690 ("bpf: Add BPF_OBJ_GET_INFO_BY_FD")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2017-07-27 21:02:46 +02:00 committed by David S. Miller
parent c9f2c1ae12
commit 89b096898a
1 changed files with 1 additions and 1 deletions
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kernel/bpf/syscall.c
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@ -1289,7 +1289,7 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
info_len = min_t(u32, sizeof(info), info_len);
if (copy_from_user(&info, uinfo, info_len))
return err;
return -EFAULT;
info.type = prog->type;
info.id = prog->aux->id;