From: Wei Yongjun weiyongjun1@huawei.com
[ Upstream commit 7f645462ca01d01abb94d75e6768c8b3ed3a188b ]
Fix to return negative error code -EFAULT from the copy_to_user() error handling case instead of 0, as done elsewhere in this function.
Fixes: bd513cd08f10 ("bpf: add MAP_LOOKUP_AND_DELETE_ELEM syscall") Signed-off-by: Wei Yongjun weiyongjun1@huawei.com Signed-off-by: Daniel Borkmann daniel@iogearbox.net Link: https://lore.kernel.org/bpf/20200430081851.166996-1-weiyongjun1@huawei.com Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/bpf/syscall.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 3b92aea18ae75..e04ea4c8f9358 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -1480,8 +1480,10 @@ static int map_lookup_and_delete_elem(union bpf_attr *attr) if (err) goto free_value;
- if (copy_to_user(uvalue, value, value_size) != 0) + if (copy_to_user(uvalue, value, value_size) != 0) { + err = -EFAULT; goto free_value; + }
err = 0;