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In ngt_input(), do not derefer sc (= (sc_p) tp->t_lsc) before making

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sure sc != NULL.
This commit is contained in:
Seigo Tanimura 2005-10-08 11:03:29 +00:00
parent 7f33c2df93
commit 314378233c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=151085
1 changed files with 5 additions and 2 deletions
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7
sys/netgraph/ng_tty.c
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@ -331,15 +331,18 @@ ngt_tioctl(struct tty *tp, u_long cmd, caddr_t data, int flag, struct thread *td
static int
ngt_input(int c, struct tty *tp)
{
const sc_p sc = (sc_p) tp->t_lsc;
const node_p node = sc->node;
sc_p sc;
node_p node;
struct mbuf *m;
int error = 0;
sc = (sc_p) tp->t_lsc;
if (sc == NULL)
/* No node attached */
return (0);
node = sc->node;
if (tp != sc->tp)
panic("ngt_input");