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libthread: input sanity checks

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This commit is contained in:
Russ Cox 2008-05-05 23:08:35 -04:00
parent 118dfa98b8
commit 80f2165d27
1 changed files with 3 additions and 2 deletions
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5
src/libthread/channel.c
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@ -96,9 +96,8 @@ altcanexec(Alt *a)
_Altarray *ar; _Altarray *ar;
Channel *c; Channel *c;
if(a->op == CHANNOP) if(a->op == CHANNOP || (c=a->c) == nil)
return 0; return 0;
c = a->c;
if(c->bufsize == 0){ if(c->bufsize == 0){
ar = chanarray(c, otherop(a->op)); ar = chanarray(c, otherop(a->op));
return ar && ar->n; return ar && ar->n;
@ -119,6 +118,8 @@ altqueue(Alt *a)
{ {
_Altarray *ar; _Altarray *ar;
if(a->c == nil)
return;
ar = chanarray(a->c, a->op); ar = chanarray(a->c, a->op);
addarray(ar, a); addarray(ar, a);
} }