This is a note to let you know that I've just added the patch titled
ntfs3: Change to non-blocking allocation in ntfs_d_hash
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ntfs3-change-to-non-blocking-allocation-in-ntfs_d_ha.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 25ac9f3d957e73da2736c05853760458c2fb5802
Author: Diogo Jahchan Koike <djahchankoike@xxxxxxxxx>
Date: Mon Sep 2 14:19:32 2024 -0300
ntfs3: Change to non-blocking allocation in ntfs_d_hash
[ Upstream commit 589996bf8c459deb5bbc9747d8f1c51658608103 ]
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@xxxxxxxxxxxxxxxxxxxxxxxxx
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 <djahchankoike@xxxxxxxxx>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ntfs3/namei.c b/fs/ntfs3/namei.c
index b5687d74b4495..bcdc1ec90a96a 100644
--- a/fs/ntfs3/namei.c
+++ b/fs/ntfs3/namei.c
@@ -501,7 +501,7 @@ 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;
@@ -523,7 +523,7 @@ 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;
}
