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@xxxxxxxxx>
---
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 2ff949ea8..e71be67f1 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -822,11 +822,18 @@ 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];
--
2.42.0
