linux_dsm_epyc7002/tools/bpf
Daniel T. Lee 96b2eb6e77 tools, bpftool: Fix struct_ops command invalid pointer free
In commit 65c9362859 ("bpftool: Add struct_ops support") a new
type of command named struct_ops has been added. This command requires
a kernel with CONFIG_DEBUG_INFO_BTF=y set and for retrieving BTF info
in bpftool, the helper get_btf_vmlinux() is used.

When running this command on kernel without BTF debug info, this will
lead to 'btf_vmlinux' variable being an invalid(error) pointer. And by
this, btf_free() causes a segfault when executing 'bpftool struct_ops'.

This commit adds pointer validation with IS_ERR not to free invalid
pointer, and this will fix the segfault issue.

Fixes: 65c9362859 ("bpftool: Add struct_ops support")
Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200410020612.2930667-1-danieltimlee@gmail.com
2020-04-14 21:33:53 +02:00
..
bpftool tools, bpftool: Fix struct_ops command invalid pointer free 2020-04-14 21:33:53 +02:00
runqslower SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
bpf_asm.c
bpf_dbg.c
bpf_exp.l
bpf_exp.y
bpf_jit_disasm.c
Makefile tools/bpf: Add runqslower tool to tools/bpf 2020-01-13 17:48:13 -08:00
Makefile.helpers