diff options
Diffstat (limited to 'net/x25/x25_subr.c')
| -rw-r--r-- | net/x25/x25_subr.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/net/x25/x25_subr.c b/net/x25/x25_subr.c index 24a342ebc7f..6b5af65f491 100644 --- a/net/x25/x25_subr.c +++ b/net/x25/x25_subr.c @@ -23,6 +23,8 @@ * restriction on response. */ +#define pr_fmt(fmt) "X25: " fmt + #include <linux/slab.h> #include <linux/kernel.h> #include <linux/string.h> @@ -148,7 +150,7 @@ void x25_write_internal(struct sock *sk, int frametype) case X25_RESET_CONFIRMATION: break; default: - printk(KERN_ERR "X.25: invalid frame type %02X\n", frametype); + pr_err("invalid frame type %02X\n", frametype); return; } @@ -269,7 +271,11 @@ int x25_decode(struct sock *sk, struct sk_buff *skb, int *ns, int *nr, int *q, int *d, int *m) { struct x25_sock *x25 = x25_sk(sk); - unsigned char *frame = skb->data; + unsigned char *frame; + + if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) + return X25_ILLEGAL; + frame = skb->data; *ns = *nr = *q = *d = *m = 0; @@ -294,6 +300,10 @@ int x25_decode(struct sock *sk, struct sk_buff *skb, int *ns, int *nr, int *q, if (frame[2] == X25_RR || frame[2] == X25_RNR || frame[2] == X25_REJ) { + if (!pskb_may_pull(skb, X25_EXT_MIN_LEN)) + return X25_ILLEGAL; + frame = skb->data; + *nr = (frame[3] >> 1) & 0x7F; return frame[2]; } @@ -308,6 +318,10 @@ int x25_decode(struct sock *sk, struct sk_buff *skb, int *ns, int *nr, int *q, if (x25->neighbour->extended) { if ((frame[2] & 0x01) == X25_DATA) { + if (!pskb_may_pull(skb, X25_EXT_MIN_LEN)) + return X25_ILLEGAL; + frame = skb->data; + *q = (frame[0] & X25_Q_BIT) == X25_Q_BIT; *d = (frame[0] & X25_D_BIT) == X25_D_BIT; *m = (frame[3] & X25_EXT_M_BIT) == X25_EXT_M_BIT; @@ -326,7 +340,7 @@ int x25_decode(struct sock *sk, struct sk_buff *skb, int *ns, int *nr, int *q, } } - printk(KERN_DEBUG "X.25: invalid PLP frame %02X %02X %02X\n", + pr_debug("invalid PLP frame %02X %02X %02X\n", frame[0], frame[1], frame[2]); return X25_ILLEGAL; |