From: Toke Høiland-Jørgensen Date: Tue, 14 Apr 2020 14:50:24 +0000 (+0200) Subject: libbpf: Fix type of old_fd in bpf_xdp_set_link_opts X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=49b452c382da2c2d1ccee1265cbb92da905c82f7;p=linux.git libbpf: Fix type of old_fd in bpf_xdp_set_link_opts The 'old_fd' parameter used for atomic replacement of XDP programs is supposed to be an FD, but was left as a u32 from an earlier iteration of the patch that added it. It was converted to an int when read, so things worked correctly even with negative values, but better change the definition to correctly reflect the intention. Fixes: bd5ca3ef93cd ("libbpf: Add function to set link XDP fd while specifying old program") Reported-by: David Ahern Signed-off-by: Toke Høiland-Jørgensen Signed-off-by: Daniel Borkmann Acked-by: David Ahern Acked-by: Song Liu Link: https://lore.kernel.org/bpf/20200414145025.182163-1-toke@redhat.com --- diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index 44df1d3e7287f..f1dacecb1619f 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -458,7 +458,7 @@ struct xdp_link_info { struct bpf_xdp_set_link_opts { size_t sz; - __u32 old_fd; + int old_fd; }; #define bpf_xdp_set_link_opts__last_field old_fd