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linux/tools/lib/bpf
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Andreas Ziegler e072d3562c libbpf: Add NULL checks to bpf_object__{prev_map,next_map} 
[ Upstream commit cedc12c5b5 ]

In the current state, an erroneous call to
bpf_object__find_map_by_name(NULL, ...) leads to a segmentation
fault through the following call chain:

  bpf_object__find_map_by_name(obj = NULL, ...)
  -> bpf_object__for_each_map(pos, obj = NULL)
  -> bpf_object__next_map((obj = NULL), NULL)
  -> return (obj = NULL)->maps

While calling bpf_object__find_map_by_name with obj = NULL is
obviously incorrect, this should not lead to a segmentation
fault but rather be handled gracefully.

As __bpf_map__iter already handles this situation correctly, we
can delegate the check for the regular case there and only add
a check in case the prev or next parameter is NULL.

Signed-off-by: Andreas Ziegler <ziegler.andreas@siemens.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240703083436.505124-1-ziegler.andreas@siemens.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-09-12 11:10:23 +02:00
..
.gitignore libbpf: Make libbpf_version.h non-auto-generated 2021-09-13 15:36:47 -07:00
bpf.c libbpf: Clean up deprecated and legacy aliases 2022-08-17 22:42:56 +02:00
bpf.h libbpf: Add missing LIBBPF_API annotation to libbpf_set_memlock_rlim API 2024-03-26 18:20:32 -04:00
bpf_core_read.h bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD 2024-07-11 12:47:09 +02:00
bpf_endian.h libbpf: Make bpf_endian co-exist with vmlinux.h 2020-07-01 09:06:12 +02:00
bpf_gen_internal.h Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2021-12-10 15:56:13 -08:00
bpf_helpers.h libbpf: fix offsetof() and container_of() to work with CO-RE 2023-07-19 16:21:04 +02:00
bpf_prog_linfo.c libbpf: Streamline error reporting for high-level APIs 2021-05-25 17:32:35 -07:00
bpf_tracing.h libbpf: Fix invalid return address register in s390 2023-03-10 09:32:51 +01:00
btf.c libbpf: Fix btf__align_of() by taking into account field offsets 2023-03-10 09:32:49 +01:00
btf.h libbpf: Don't require full struct enum64 in UAPI headers 2022-09-27 20:45:17 +02:00
btf_dump.c libbpf: Fix no-args func prototype BTF dumping syntax 2024-08-03 08:49:48 +02:00
Build libbpf: move xsk.{c,h} into selftests/bpf 2022-06-28 13:13:32 -07:00
gen_loader.c libbpf: Fix ld_imm64 copy logic for ksym in light skeleton. 2023-05-11 23:03:18 +09:00
hashmap.c libbpf: Use IS_ERR_OR_NULL() in hashmap__free() 2022-01-12 17:01:36 -08:00
hashmap.h libbpf, hashmap: Fix undefined behavior in hash_bits 2020-11-02 23:33:51 +01:00
libbpf.c libbpf: Add NULL checks to bpf_object__{prev_map,next_map} 2024-09-12 11:10:23 +02:00
libbpf.h libbpf: restore memory layout of bpf_object_open_opts 2022-09-23 16:19:37 -07:00
libbpf.map bpf: Add libbpf logic for user-space ring buffer 2022-09-21 16:25:03 -07:00
libbpf.pc.template libbpf: Add zlib as a dependency in pkg-config template 2019-12-16 14:55:29 -08:00
libbpf_common.h libbpf: cleanup LIBBPF_DEPRECATED_SINCE supporting macros for v0.x 2022-06-28 13:13:33 -07:00
libbpf_errno.c libbpf: Streamline error reporting for high-level APIs 2021-05-25 17:32:35 -07:00
libbpf_internal.h libbpf: Fix faccessat() usage on Android 2024-03-26 18:20:32 -04:00
libbpf_legacy.h libbpf: Clean up deprecated and legacy aliases 2022-08-17 22:42:56 +02:00
libbpf_probes.c libbpf: Use page size as max_entries when probing ring buffer map 2022-11-17 15:46:05 -08:00
libbpf_version.h bpf: Add libbpf logic for user-space ring buffer 2022-09-21 16:25:03 -07:00
linker.c libbpf: Checking the btf_type kind when fixing variable offsets 2024-08-03 08:49:06 +02:00
Makefile libbpf: move xsk.{c,h} into selftests/bpf 2022-06-28 13:13:32 -07:00
netlink.c libbpf: Streamline bpf_attr and perf_event_attr initialization 2022-08-17 22:42:10 +02:00
nlattr.c libbpf: Fix alen calculation in libbpf_nla_dump_errormsg() 2023-03-10 09:33:02 +01:00
nlattr.h libbpf: Switch to void * casting in netlink helpers 2021-06-22 17:04:02 +02:00
relo_core.c bpf: Correctly propagate errors up from bpf_core_composites_match 2022-07-08 15:31:43 -07:00
relo_core.h bpf, libbpf: Add type match support 2022-07-05 21:14:25 -07:00
ringbuf.c libbpf: Check the validity of size in user_ring_buffer__reserve() 2022-11-17 15:49:59 -08:00
skel_internal.h libbpf: add map_get_fd_by_id and map_delete_elem in light skeleton 2022-08-25 18:52:29 -07:00
str_error.c libbpf: Poison kernel-only integer types 2020-01-10 10:38:00 -08:00
str_error.h libbpf: relicense libbpf as LGPL-2.1 OR BSD-2-Clause 2018-10-08 10:09:48 +02:00
strset.c libbpf: Fix memory leak in strset 2021-10-01 22:54:38 +02:00
strset.h libbpf: Extract internal set-of-strings datastructure APIs 2021-03-18 16:14:22 -07:00
usdt.bpf.h libbpf: Ensure functions with always_inline attribute are inline 2022-08-04 14:43:41 -07:00
usdt.c libbpf: Fix realloc API handling in zero-sized edge cases 2023-09-13 09:42:30 +02:00