[strongSwan-dev] [PATCH] farp: Fix BPF jump false offset

[Volker Rümelin]

Jump to BPF_STMT(BPF_RET+BPF_K, 0) if protocol_size != 4
---
 src/libcharon/plugins/farp/farp_spoofer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libcharon/plugins/farp/farp_spoofer.c b/src/libcharon/plugins/farp/farp_spoofer.c
index c2715bd..5753f79 100644
--- a/src/libcharon/plugins/farp/farp_spoofer.c
+++ b/src/libcharon/plugins/farp/farp_spoofer.c
@@ -143,7 +143,7 @@ farp_spoofer_t *farp_spoofer_create(farp_listener_t *listener)
 		BPF_STMT(BPF_LD+BPF_B+BPF_ABS, offsetof(arp_t, hardware_size)),
 		BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 6, 0, 7),
 		BPF_STMT(BPF_LD+BPF_B+BPF_ABS, offsetof(arp_t, protocol_size)),
-		BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 4, 0, 4),
+		BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 4, 0, 5),
 		BPF_STMT(BPF_LD+BPF_H+BPF_ABS, offsetof(arp_t, opcode)),
 		BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, ARPOP_REQUEST, 0, 3),
 		BPF_STMT(BPF_LD+BPF_W+BPF_LEN, 0),
-- 
1.8.4.5