Subject: [PATCH] ip/xfrm: Fix potential SIGSEGV when printing extra flags

From: Thomas Egerer <[email-masked]>
Date: Thu, 29 Aug 2013 14:00:36 +0200

The git-commit dc8867d0, that added support for displaying the
extra-flags of a state, introduced a potential segfault.
Trying to show a state without the extra-flag attribute and show_stats
enabled, would cause the NULL pointer in tb[XFRMA_SA_EXTRA_FLAGS] to be
dereferenced.

Signed-off-by: Thomas Egerer <[email-masked]>
---
 ip/ipxfrm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ip/ipxfrm.c b/ip/ipxfrm.c
index 0a3a9fb..411d9d5 100644
--- a/ip/ipxfrm.c
+++ b/ip/ipxfrm.c
@@ -856,7 +856,7 @@ void xfrm_state_info_print(struct xfrm_usersa_info *xsinfo,
 		if (flags)
 			fprintf(fp, "%x", flags);
 	}
-	if (show_stats > 0 || tb[XFRMA_SA_EXTRA_FLAGS]) {
+	if (show_stats > 0 && tb[XFRMA_SA_EXTRA_FLAGS]) {
 		__u32 extra_flags = *(__u32 *)RTA_DATA(tb[XFRMA_SA_EXTRA_FLAGS]);
 
 		fprintf(fp, "extra_flag ");