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fix breakage in do_rmdir()

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syzbot reported and bisected a use-after-free due to the recent init
cleanups.

The putname() should happen only after we'd *not* branched to retry,
same as it's done in do_unlinkat().

Reported-by: syzbot+bbeb1c88016c7db4aa24@syzkaller.appspotmail.com
Fixes: e24ab0ef68 "fs: push the getname from do_rmdir into the callers"
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Al Viro 2020-08-12 05:15:18 +01:00 committed by Linus Torvalds
parent fb893de323
commit 24fb33d40d
1 changed files with 1 additions and 1 deletions
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2
fs/namei.c
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@ -3770,11 +3770,11 @@ long do_rmdir(int dfd, struct filename *name)
mnt_drop_write(path.mnt);
exit1:
path_put(&path);
putname(name);
if (retry_estale(error, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
putname(name);
return error;
}