From patchwork Tue Oct 4 10:58:07 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [maverick/ti-omap4, CVE, 1/1] memory corruption in X.25 facilities parsing Date: Tue, 04 Oct 2011 00:58:07 -0000 From: Andy Whitcroft X-Patchwork-Id: 117598 Message-Id: <1317725887-19677-2-git-send-email-apw@canonical.com> To: kernel-team@lists.ubuntu.com Cc: Andy Whitcroft From: andrew hendry Signed-of-by: Andrew Hendry Signed-off-by: David S. Miller (cherry picked from commit a6331d6f9a4298173b413cf99a40cc86a9d92c37) CVE-2010-3873 Signed-off-by: Andy Whitcroft Acked-by: Stefan Bader --- net/x25/x25_facilities.c | 8 ++++---- net/x25/x25_in.c | 2 ++ 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/net/x25/x25_facilities.c b/net/x25/x25_facilities.c index 8f15284..55187c8 100644 --- a/net/x25/x25_facilities.c +++ b/net/x25/x25_facilities.c @@ -142,15 +142,15 @@ int x25_parse_facilities(struct sk_buff *skb, struct x25_facilities *facilities, return 0; switch (*p) { case X25_FAC_CALLING_AE: - if (p[1] > X25_MAX_DTE_FACIL_LEN) - break; + if (p[1] > X25_MAX_DTE_FACIL_LEN || p[1] <= 1) + return 0; dte_facs->calling_len = p[2]; memcpy(dte_facs->calling_ae, &p[3], p[1] - 1); *vc_fac_mask |= X25_MASK_CALLING_AE; break; case X25_FAC_CALLED_AE: - if (p[1] > X25_MAX_DTE_FACIL_LEN) - break; + if (p[1] > X25_MAX_DTE_FACIL_LEN || p[1] <= 1) + return 0; dte_facs->called_len = p[2]; memcpy(dte_facs->called_ae, &p[3], p[1] - 1); *vc_fac_mask |= X25_MASK_CALLED_AE; diff --git a/net/x25/x25_in.c b/net/x25/x25_in.c index 6317896..f729f02 100644 --- a/net/x25/x25_in.c +++ b/net/x25/x25_in.c @@ -119,6 +119,8 @@ static int x25_state1_machine(struct sock *sk, struct sk_buff *skb, int frametyp &x25->vc_facil_mask); if (len > 0) skb_pull(skb, len); + else + return -1; /* * Copy any Call User Data. */