| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.6 080/194] bpf: Fix error return code in map_lookup_and_delete_elem() | Date | Mon, 18 May 2020 19:36:10 +0200 |
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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; -- 2.20.1
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