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devip: fix crash on negative dev id on attach

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This commit is contained in:
cinap_lenrek 2018-02-25 03:32:29 +01:00
parent 05cd5cb200
commit 5560efb3db
1 changed files with 20 additions and 30 deletions
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50
sys/src/9/ip/devip.c
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@ -256,32 +256,6 @@ ipreset(void)
fmtinstall('M', eipfmt);
}
static Fs*
ipgetfs(int dev)
{
extern void (*ipprotoinit[])(Fs*);
Fs *f;
int i;
if(dev >= Nfs)
return nil;
qlock(&fslock);
if(ipfs[dev] == nil){
f = smalloc(sizeof(Fs));
ip_init(f);
arpinit(f);
netloginit(f);
for(i = 0; ipprotoinit[i]; i++)
ipprotoinit[i](f);
f->dev = dev;
ipfs[dev] = f;
}
qunlock(&fslock);
return ipfs[dev];
}
IPaux*
newipaux(char *owner, char *tag)
{
@ -303,14 +277,30 @@ newipaux(char *owner, char *tag)
static Chan*
ipattach(char* spec)
{
ulong dev;
Chan *c;
int dev;
dev = atoi(spec);
dev = strtoul(spec, nil, 0);
if(dev >= Nfs)
error("bad specification");
error(Ebadspec);
qlock(&fslock);
if(ipfs[dev] == nil){
extern void (*ipprotoinit[])(Fs*);
Fs *f;
int i;
f = smalloc(sizeof(Fs));
ip_init(f);
arpinit(f);
netloginit(f);
for(i = 0; ipprotoinit[i]; i++)
ipprotoinit[i](f);
f->dev = dev;
ipfs[dev] = f;
}
qunlock(&fslock);
ipgetfs(dev);
c = devattach('I', spec);
mkqid(&c->qid, QID(0, 0, Qtopdir), 0, QTDIR);
c->dev = dev;