| Date | Tue, 07 Dec 2010 16:44:54 -0800 | From | Greg KH <> | Subject | [108/127] memory corruption in X.25 facilities parsing |
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2.6.32-stable review patch. If anyone has any objections, please let us know.
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From: andrew hendry <andrew.hendry@gmail.com>
commit a6331d6f9a4298173b413cf99a40cc86a9d92c37 upstream.
Signed-of-by: Andrew Hendry <andrew.hendry@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- net/x25/x25_facilities.c | 8 ++++---- net/x25/x25_in.c | 2 ++ 2 files changed, 6 insertions(+), 4 deletions(-)
--- a/net/x25/x25_facilities.c +++ b/net/x25/x25_facilities.c @@ -134,15 +134,15 @@ int x25_parse_facilities(struct sk_buff case X25_FAC_CLASS_D: 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; --- a/net/x25/x25_in.c +++ b/net/x25/x25_in.c @@ -118,6 +118,8 @@ static int x25_state1_machine(struct soc &x25->vc_facil_mask); if (len > 0) skb_pull(skb, len); + else + return -1; /* * Copy any Call User Data. */
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