Shung-Hsi Yu 6706135577 libbpf: Fix null-pointer dereference in find_prog_by_sec_insn() ...

[ Upstream commit d0d382f95a9270dcf803539d6781d6bd67e3f5b2 ]

When there are no program sections, obj->programs is left unallocated,
and find_prog_by_sec_insn()'s search lands on &obj->programs[0] == NULL,
and will cause null-pointer dereference in the following access to
prog->sec_idx.

Guard the search with obj->nr_programs similar to what's being done in
__bpf_program__iter() to prevent null-pointer access from happening.

Fixes: db2b8b06423c ("libbpf: Support CO-RE relocations for multi-prog sections")
Signed-off-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20221012022353.7350-4-shung-hsi.yu@suse.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

2022-12-31 13:14:06 +01:00

..

api

tools api fs: Cache cgroupfs mount point

2021-02-17 15:09:08 -03:00

bpf

libbpf: Fix null-pointer dereference in find_prog_by_sec_insn()

2022-12-31 13:14:06 +01:00

lockdep

.gitignore: add SPDX License Identifier

2020-03-25 11:50:48 +01:00

perf

perf tools: Fix segfault accessing sample_id xyarray

2022-04-27 14:38:50 +02:00

subcmd

libsubcmd: Fix use-after-free for realloc(..., 0)

2022-02-23 12:03:12 +01:00

symbol

libsymbols kallsyms: Move hex2u64 out of header

2020-05-05 16:35:32 -03:00

traceevent

KVM: x86/mmu: Rename "nxe" role bit to "efer_nx" for macro shenanigans

2021-06-24 18:00:41 -04:00

argv_split.c

tools lib: Move argv_{split,free} from tools/perf/util/

2019-07-01 22:50:40 -03:00

bitmap.c

tools lib: Adopt bitmap_intersects() operation from the kernel sources

2021-06-30 15:28:00 -03:00

ctype.c

tools perf: Move from sane_ctype.h obtained from git to the Linux's original

2019-06-25 21:02:47 -03:00

find_bit.c

tools: sync lib/find_bit implementation

2021-05-06 19:24:12 -07:00

hweight.c

…

rbtree.c

tools/: replace HTTP links with HTTPS ones

2020-08-07 11:33:21 -07:00

str_error_r.c

…

string.c

tools lib: Adopt memchr_inv() from kernel

2020-11-27 08:34:52 -03:00

vsprintf.c

perf script: Pad DSO name for --call-trace

2019-05-28 18:37:44 -03:00

zalloc.c

tools lib: Adopt zalloc()/zfree() from tools/perf

2019-07-09 10:13:26 -03:00