Andrii Nakryiko 179a2a8a7b libbpf: Fix realloc API handling in zero-sized edge cases ... [ Upstream commit 8a0260dbf6 ] realloc() and reallocarray() can either return NULL or a special non-NULL pointer, if their size argument is zero. This requires a bit more care to handle NULL-as-valid-result situation differently from NULL-as-error case. This has caused real issues before ([0]), and just recently bit again in production when performing bpf_program__attach_usdt(). This patch fixes 4 places that do or potentially could suffer from this mishandling of NULL, including the reported USDT-related one. There are many other places where realloc()/reallocarray() is used and NULL is always treated as an error value, but all those have guarantees that their size is always non-zero, so those spot don't need any extra handling. [0] d08ab82f59 ("libbpf: Fix double-free when linker processes empty sections") Fixes: 999783c8bb ("libbpf: Wire up spec management and other arch-independent USDT logic") Fixes: b63b3c490e ("libbpf: Add bpf_program__set_insns function") Fixes: 697f104db8 ("libbpf: Support custom SEC() handlers") Fixes: b126882672 ("libbpf: Change the order of data and text relocations.") Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20230711024150.1566433-1-andrii@kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-09-13 09:48:00 +02:00
..
api	tools api: Add io__getline	2023-04-04 13:23:59 -03:00
bpf	libbpf: Fix realloc API handling in zero-sized edge cases	2023-09-13 09:48:00 +02:00
perf	libperf rc_check: Enable implicitly with sanitizers	2023-04-20 15:12:02 -03:00
subcmd	tools lib subcmd: Add dependency test to install_headers	2022-12-14 11:16:12 -03:00
symbol	tools lib symbol: Add dependency test to install_headers	2022-12-14 11:16:12 -03:00
thermal	tools/lib/thermal: Fix include path for libnl3 in pkg-config file.	2023-02-15 17:29:40 +01:00
argv_split.c	…
bitmap.c	Bitmap patches for v6.0-rc1	2022-08-07 17:52:35 -07:00
ctype.c	…
find_bit.c	tools: sync find_bit() implementation	2022-09-21 12:21:44 -07:00
hweight.c	…
list_sort.c	tools lib: Adopt list_sort() from the kernel sources	2021-10-20 10:30:59 -03:00
rbtree.c	…
slab.c	tools: Move gfp.h and slab.h from radix-tree to lib	2022-02-20 08:44:37 +02:00
str_error_r.c	…
string.c	tools lib: Adopt memchr_inv() from kernel	2020-11-27 08:34:52 -03:00
vsprintf.c	…
zalloc.c	…