[PATCH bpf 1/3] libbpf: ensure umem pointer is non-NULL before dereferencing
From: Ciara Loftus <hidden>
Date: 2021-03-24 14:45:46
Also in:
bpf
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [library] (libbpf), the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
Calls to xsk_socket__create dereference the umem to access the
fill_save and comp_save pointers. Make sure the umem is non-NULL
before doing this.
Fixes: 2f6324a3937f ("libbpf: Support shared umems between queues and devices")
Signed-off-by: Ciara Loftus <redacted>
---
tools/lib/bpf/xsk.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c
index 526fc35c0b23..443b0cfb45e8 100644
--- a/tools/lib/bpf/xsk.c
+++ b/tools/lib/bpf/xsk.c@@ -1019,6 +1019,9 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname, struct xsk_ring_cons *rx, struct xsk_ring_prod *tx, const struct xsk_socket_config *usr_config) { + if (!umem) + return -EFAULT; + return xsk_socket__create_shared(xsk_ptr, ifname, queue_id, umem, rx, tx, umem->fill_save, umem->comp_save, usr_config);
--
2.17.1