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devproc: fix close and closefiles procctl

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for the CMclose procctl, the fd number was not
bounds checked before indexing in the Fgrp.fd
array.

for the CMclosefiles, we looped fd from 0..maxfd-1,
but need to loop from 0..maxfd as maxfd is inclusive.
This commit is contained in:
cinap_lenrek 2014-05-26 22:43:21 +02:00
parent c5214cd6d9
commit 89acedb9b8
1 changed files with 17 additions and 22 deletions
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39
sys/src/9/port/devproc.c
View file

@ -1270,39 +1270,34 @@ procstopwait(Proc *p, int ctl)
error(Eprocdied);
}
static void
procctlcloseone(Proc *p, Fgrp *f, int fd)
{
Chan *c;
c = f->fd[fd];
if(c == nil)
return;
f->fd[fd] = nil;
unlock(f);
qunlock(&p->debug);
cclose(c);
qlock(&p->debug);
lock(f);
}
void
procctlclosefiles(Proc *p, int all, int fd)
{
int i;
Fgrp *f;
Chan *c;
if(fd < 0)
error(Ebadfd);
f = p->fgrp;
if(f == nil)
error(Eprocdied);
lock(f);
f->ref++;
if(all)
for(i = 0; i < f->maxfd; i++)
procctlcloseone(p, f, i);
else
procctlcloseone(p, f, fd);
while(fd <= f->maxfd){
c = f->fd[fd];
if(c != nil){
f->fd[fd] = nil;
unlock(f);
qunlock(&p->debug);
cclose(c);
qlock(&p->debug);
lock(f);
}
if(!all)
break;
fd++;
}
unlock(f);
closefgrp(f);
}