From 5e10c4208a7b87b4bc0e42622109a6d9e8453419 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Fri, 15 Feb 2008 01:32:40 -0800 Subject: [PATCH] AUDIT: Increase skb->truesize in audit_expand Upstream commit: 406a1d868001423c85a3165288e566e65f424fe6 The recent UDP patch exposed this bug in the audit code. It was calling pskb_expand_head without increasing skb->truesize. The caller of pskb_expand_head needs to do so because that function is designed to be called in places where truesize is already fixed and therefore it doesn't update its value. Because the audit system is using it in a place where the truesize has not yet been fixed, it needs to update its value manually. Signed-off-by: Herbert Xu Acked-by: James Morris Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- kernel/audit.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/kernel/audit.c b/kernel/audit.c index f93c2713017d..801c946dd24b 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1200,13 +1200,17 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, static inline int audit_expand(struct audit_buffer *ab, int extra) { struct sk_buff *skb = ab->skb; - int ret = pskb_expand_head(skb, skb_headroom(skb), extra, - ab->gfp_mask); + int oldtail = skb_tailroom(skb); + int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask); + int newtail = skb_tailroom(skb); + if (ret < 0) { audit_log_lost("out of memory in audit_expand"); return 0; } - return skb_tailroom(skb); + + skb->truesize += newtail - oldtail; + return newtail; } /* -- 2.39.5