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nfsd: fix dentry leak upon mkdir failure.

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syzbot is reporting that nfsd_mkdir() forgot to remove dentry created by
d_alloc_name() when __nfsd_mkdir() failed (due to memory allocation fault
injection) [1].

[1] https://syzkaller.appspot.com/bug?id=ce41a1f769ea4637ebffedf004a803e8405b4674

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: syzbot <syzbot+2c95195d5d433f6ed6cb@syzkaller.appspotmail.com>
Fixes: e8a79fb14f ("nfsd: add nfsd/clients directory")
[bfields: clean up in nfsd_mkdir instead of __nfsd_mkdir]
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Tetsuo Handa 2019-08-12 11:16:11 +09:00 committed by J. Bruce Fields
parent 609488bc97
commit d6846bfbee
1 changed files with 1 additions and 0 deletions
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1
fs/nfsd/nfsctl.c
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@ -1205,6 +1205,7 @@ static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *nc
inode_unlock(dir);
return dentry;
out_err:
dput(dentry);
dentry = ERR_PTR(ret);
goto out;
}