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| author | Yonghong Song <yhs@fb.com> | 2020-08-21 12:10:54 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-08-24 21:03:07 -0700 |
| commit | b474959d5afda6e341a02c85f9595d85d39189ae (patch) | |
| tree | eb61755165d1e65bdd944d7b48239392c59e31d6 /sound/isa | |
| parent | 99408c422d336db32bfab5cbebc10038a70cf7d2 (diff) | |
bpf: Fix a buffer out-of-bound access when filling raw_tp link_info
Commit f2e10bff16a0 ("bpf: Add support for BPF_OBJ_GET_INFO_BY_FD for bpf_link")
added link query for raw_tp. One of fields in link_info is to
fill a user buffer with tp_name. The Scurrent checking only
declares "ulen && !ubuf" as invalid. So "!ulen && ubuf" will be
valid. Later on, we do "copy_to_user(ubuf, tp_name, ulen - 1)" which
may overwrite user memory incorrectly.
This patch fixed the problem by disallowing "!ulen && ubuf" case as well.
Fixes: f2e10bff16a0 ("bpf: Add support for BPF_OBJ_GET_INFO_BY_FD for bpf_link")
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200821191054.714731-1-yhs@fb.com
Diffstat (limited to 'sound/isa')
0 files changed, 0 insertions, 0 deletions