[PATCH] bpftool: fix potential NULL pointer dereferencing in prog_dump()

[Amir Mohammadi]

A NULL pointer dereference could occur if ksyms
is not properly checked before usage in the prog_dump() function.

Signed-off-by: Amir Mohammadi <amiremohamadi@xxxxxxxxx>
---
 tools/bpf/bpftool/prog.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index 2ff949ea8..8b5300103 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -822,11 +822,12 @@ 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;
 
 				img += lens[i];
 
-- 
2.42.0