The patch titled Subject: proc: fix type confusion in pde_set_flags() has been added to the -mm mm-hotfixes-unstable branch. Its filename is proc-fix-type-confusion-in-pde_set_flags.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: wangzijie wangzijie1@honor.com Subject: proc: fix type confusion in pde_set_flags() Date: Thu, 4 Sep 2025 21:57:15 +0800

Commit 2ce3d282bd50 ("proc: fix missing pde_set_flags() for net proc files") missed a key part in the definition of proc_dir_entry:

union { const struct proc_ops *proc_ops; const struct file_operations *proc_dir_ops; };

So dereference of ->proc_ops assumes it is a proc_ops structure results in type confusion and make NULL check for 'proc_ops' not work for proc dir.

Add !S_ISDIR(dp->mode) test before calling pde_set_flags() to fix it.

Link: https://lkml.kernel.org/r/20250904135715.3972782-1-wangzijie1@honor.com Fixes: 2ce3d282bd50 ("proc: fix missing pde_set_flags() for net proc files") Signed-off-by: wangzijie wangzijie1@honor.com Reported-by: Brad Spengler spender@grsecurity.net Cc: Alexey Dobriyan adobriyan@gmail.com Cc: Al Viro viro@zeniv.linux.org.uk Cc: Christian Brauner brauner@kernel.org Cc: Jiri Slaby jirislaby@kernel.org Cc: Stefano Brivio sbrivio@redhat.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

fs/proc/generic.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/proc/generic.c~proc-fix-type-confusion-in-pde_set_flags +++ a/fs/proc/generic.c @@ -393,7 +393,8 @@ struct proc_dir_entry *proc_register(str if (proc_alloc_inum(&dp->low_ino)) goto out_free_entry;

- pde_set_flags(dp); + if (!S_ISDIR(dp->mode)) + pde_set_flags(dp);

write_lock(&proc_subdir_lock); dp->parent = dir; _

Patches currently in -mm which might be from wangzijie1@honor.com are

proc-fix-type-confusion-in-pde_set_flags.patch