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devsd: check return value of ifc->enable(), don't leak unit name/user strings

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This commit is contained in:
cinap_lenrek 2017-03-26 16:45:34 +02:00
parent 1889aa50c3
commit 019bb580da
1 changed files with 6 additions and 5 deletions
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11
sys/src/9/port/devsd.c
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@ -293,30 +293,31 @@ sdgetunit(SDev* sdev, int subno)
qunlock(&sdev->unitlock);
return nil;
}
if((unit = malloc(sizeof(SDunit))) == nil){
qunlock(&sdev->unitlock);
return nil;
}
sdev->unitflg[subno] = 1;
snprint(buf, sizeof buf, "%s%x", sdev->name, subno);
kstrdup(&unit->name, buf);
kstrdup(&unit->user, eve);
unit->perm = 0555;
unit->subno = subno;
unit->dev = sdev;
if(sdev->enabled == 0 && sdev->ifc->enable)
sdev->ifc->enable(sdev);
sdev->enabled = 1;
sdev->enabled = sdev->ifc->enable(sdev);
/*
* No need to lock anything here as this is only
* called before the unit is made available in the
* sdunit[] array.
*/
if(unit->dev->ifc->verify(unit) == 0){
if(sdev->enabled == 0 || unit->dev->ifc->verify(unit) == 0){
qunlock(&sdev->unitlock);
free(unit->name);
free(unit->user);
free(unit);
return nil;
}