5.15-stable review patch. If anyone has any objections, please let me know.
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From: Amir Mohammadi amirmohammadi1999.am@gmail.com
[ Upstream commit ef3ba8c258ee368a5343fa9329df85b4bcb9e8b5 ]
A NULL pointer dereference could occur if ksyms is not properly checked before usage in the prog_dump() function.
Fixes: b053b439b72a ("bpf: libbpf: bpftool: Print bpf_line_info during prog dump") Signed-off-by: Amir Mohammadi amiremohamadi@yahoo.com Reviewed-by: Quentin Monnet qmo@kernel.org Acked-by: John Fastabend john.fastabend@gmail.com Link: https://lore.kernel.org/r/20241121083413.7214-1-amiremohamadi@yahoo.com Signed-off-by: Alexei Starovoitov ast@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- tools/bpf/bpftool/prog.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-)
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c index 75f71c3ad4f62..64142f3d06655 100644 --- a/tools/bpf/bpftool/prog.c +++ b/tools/bpf/bpftool/prog.c @@ -744,11 +744,18 @@ prog_dump(struct bpf_prog_info *info, enum dump_mode mode, printf("%s:\n", sym_name); }
- if (disasm_print_insn(img, lens[i], opcodes, - name, disasm_opt, btf, - prog_linfo, ksyms[i], i, - linum)) - goto exit_free; + if (ksyms) { + if (disasm_print_insn(img, lens[i], opcodes, + name, disasm_opt, btf, + prog_linfo, ksyms[i], i, + linum)) + goto exit_free; + } else { + if (disasm_print_insn(img, lens[i], opcodes, + name, disasm_opt, btf, + NULL, 0, 0, false)) + goto exit_free; + }
img += lens[i];