diff mbox series

bpftool: fix control flow graph segfault during edge creation

Message ID 20250108220937.1470029-1-christoph.werle@longjmp.de (mailing list archive)
State New
Delegated to: BPF
Headers show
Series bpftool: fix control flow graph segfault during edge creation | expand

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Context Check Description
netdev/tree_selection success Not a local patch
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Commit Message

Christoph Werle Jan. 8, 2025, 10:09 p.m. UTC 
If the last instruction of a control flow graph building block is a
BPF_CALL, an incorrect edge with e->dst set to NULL is created and
results in a segfault during graph output.

Ensure that BPF_CALL as last instruction of a building block is handled
correctly and only generates a single edge unlike actual BPF_JUMP*
instructions.

Signed-off-by: Christoph Werle <christoph.werle@longjmp.de>
---
 tools/bpf/bpftool/cfg.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/tools/bpf/bpftool/cfg.c b/tools/bpf/bpftool/cfg.c
index eec437cca2ea..e3785f9a697d 100644
--- a/tools/bpf/bpftool/cfg.c
+++ b/tools/bpf/bpftool/cfg.c
@@ -302,6 +302,7 @@  static bool func_add_bb_edges(struct func_node *func)
 
 		insn = bb->tail;
 		if (!is_jmp_insn(insn->code) ||
+		    BPF_OP(insn->code) == BPF_CALL ||
 		    BPF_OP(insn->code) == BPF_EXIT) {
 			e->dst = bb_next(bb);
 			e->flags |= EDGE_FLAG_FALLTHROUGH;