From 27600805e62f800bacf990354632eae4e487d34c Mon Sep 17 00:00:00 2001 From: Yazen Ghannam Date: Thu, 3 Sep 2026 10:43:25 -0500 Subject: x86/amd_node: Fix PCI device reference counting in amd_smn_init() The local "root" pointer is a temporary variable used during the device search. Therefore, refcount related to the search iterators should be cleaned up after the search is complete. Use the __free() cleanup macro to ensure the refcount is decremented when the temporary pointer goes out of scope. Additionally, increment the refcount when caching a root pointer. This ensures the in-use refcount is separate from the temporary search refcounting. Finally, drop the redundant "root = NULL" before the second search loop. The pci_get_class() iterator always decrements the refcount of its "from" argument, so the first loop can only fall through with "root" already NULL. Fixes: 0a4b61d9c2e4 ("x86/amd_node: Fix AMD root device caching") Closes: https://sashiko.dev/#/patchset/20260806160159.230453-1-jason.andryuk%40amd.com Reported-by: Sashiko Assisted-by: LLM Signed-off-by: Yazen Ghannam Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Mario Limonciello (AMD) Cc: Link: https://patch.msgid.link/20260903154325.74343-1-yazen.ghannam@amd.com --- samples/bpf/sockex2_user.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 samples/bpf/sockex2_user.c (limited to 'samples/bpf/sockex2_user.c') diff --git a/samples/bpf/sockex2_user.c b/samples/bpf/sockex2_user.c new file mode 100644 index 000000000..2c1847133 --- /dev/null +++ b/samples/bpf/sockex2_user.c @@ -0,0 +1,62 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include "sock_example.h" +#include +#include + +struct pair { + __u64 packets; + __u64 bytes; +}; + +int main(int ac, char **argv) +{ + struct bpf_program *prog; + struct bpf_object *obj; + int map_fd, prog_fd; + char filename[256]; + int i, sock, err; + FILE *f; + + snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); + obj = bpf_object__open_file(filename, NULL); + if (libbpf_get_error(obj)) + return 1; + + prog = bpf_object__next_program(obj, NULL); + bpf_program__set_type(prog, BPF_PROG_TYPE_SOCKET_FILTER); + + err = bpf_object__load(obj); + if (err) + return 1; + + prog_fd = bpf_program__fd(prog); + map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map"); + + sock = open_raw_sock("lo"); + + assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd, + sizeof(prog_fd)) == 0); + + f = popen("ping -4 -c5 localhost", "r"); + (void) f; + + for (i = 0; i < 5; i++) { + int key = 0, next_key; + struct pair value; + + while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) { + bpf_map_lookup_elem(map_fd, &next_key, &value); + printf("ip %s bytes %lld packets %lld\n", + inet_ntoa((struct in_addr){htonl(next_key)}), + value.bytes, value.packets); + key = next_key; + } + sleep(1); + } + return 0; +} -- cgit v1.3.1