From: Diogo Jahchan Koike Date: Mon, 2 Sep 2024 17:19:32 +0000 (-0300) Subject: ntfs3: Change to non-blocking allocation in ntfs_d_hash X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=589996bf8c459deb5bbc9747d8f1c51658608103;p=users%2Fwilly%2Flinux.git ntfs3: Change to non-blocking allocation in ntfs_d_hash d_hash is done while under "rcu-walk" and should not sleep. __get_name() allocates using GFP_KERNEL, having the possibility to sleep when under memory pressure. Change the allocation to GFP_NOWAIT. Reported-by: syzbot+7f71f79bbfb4427b00e1@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=7f71f79bbfb4427b00e1 Fixes: d392e85fd1e8 ("fs/ntfs3: Fix the format of the "nocase" mount option") Signed-off-by: Diogo Jahchan Koike Signed-off-by: Konstantin Komarov --- diff --git a/fs/ntfs3/namei.c b/fs/ntfs3/namei.c index fc720ad9c57a..4c35262449d7 100644 --- a/fs/ntfs3/namei.c +++ b/fs/ntfs3/namei.c @@ -395,7 +395,7 @@ static int ntfs_d_hash(const struct dentry *dentry, struct qstr *name) /* * Try slow way with current upcase table */ - uni = __getname(); + uni = kmem_cache_alloc(names_cachep, GFP_NOWAIT); if (!uni) return -ENOMEM; @@ -417,7 +417,7 @@ static int ntfs_d_hash(const struct dentry *dentry, struct qstr *name) err = 0; out: - __putname(uni); + kmem_cache_free(names_cachep, uni); return err; }