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Merge branch 'stable-fodder' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull vfs stable fodder fixes from Al Viro:

 - acct_on() fix for deadlock caught by overlayfs folks

 - autofs RCU use-after-free SNAFU (->d_manage() can be called
   locklessly, so we need to RCU-delay freeing the objects it looks at)

 - (hopefully) the end of "do we need freeing this dentry RCU-delayed"
   whack-a-mole.

* 'stable-fodder' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  autofs: fix use-after-free in lockless ->d_manage()
  dcache: sort the freeing-without-RCU-delay mess for good.
  acct_on(): don't mess with freeze protection
This commit is contained in:
Linus Torvalds
2019-05-07 11:17:26 -07:00
parent 168e153d5e ce285c267a
commit 78438ce18f
9 changed files with 26 additions and 19 deletions
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4
kernel/acct.c
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@@ -227,7 +227,7 @@ static int acct_on(struct filename *pathname)
filp_close(file, NULL);
return PTR_ERR(internal);
}
err = mnt_want_write(internal);
err = __mnt_want_write(internal);
if (err) {
mntput(internal);
kfree(acct);
@@ -252,7 +252,7 @@ static int acct_on(struct filename *pathname)
old = xchg(&ns->bacct, &acct->pin);
mutex_unlock(&acct->lock);
pin_kill(old);
mnt_drop_write(mnt);
__mnt_drop_write(mnt);
mntput(mnt);
return 0;
}