smb: client: fix potential UAF in smb2_close_cached_fid()

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commit 734e99623c upstream.

find_or_create_cached_dir() could grab a new reference after kref_put()
had seen the refcount drop to zero but before cfid_list_lock is acquired
in smb2_close_cached_fid(), leading to use-after-free.

Switch to kref_put_lock() so cfid_release() is called with
cfid_list_lock held, closing that gap.

Fixes: ebe98f1447 ("cifs: enable caching of directories for which a lease is held")
Cc: stable@vger.kernel.org
Reported-by: Jay Shin <jaeshin@redhat.com>
Reviewed-by: Paulo Alcantara (Red Hat) <pc@manguebit.org>
Signed-off-by: Henrique Carvalho <henrique.carvalho@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Henrique Carvalho 2025-11-03 19:52:55 -03:00 • committed by Greg Kroah-Hartman

parent 3d82cb8465

commit 065bd62412

1 changed files with 9 additions and 7 deletions

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fs/smb/client/cached_dir.c

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