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ksmbd: fix possible null-deref in smb_lazy_parent_lease_break_close

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[ Upstream commit 5fb282ba4fef8985a5acf2b32681f2ec07732561 ]

rcu_dereference can return NULL, so make sure we check against that.

Signed-off-by: Marios Makassikis <mmakassikis@freebox.fr>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marios Makassikis 2024-03-13 15:11:38 +01:00 committed by Greg Kroah-Hartman
parent 8b2326963d
commit 27b40b7bfc
1 changed files with 1 additions and 1 deletions
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2
fs/smb/server/oplock.c
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@ -1152,7 +1152,7 @@ void smb_lazy_parent_lease_break_close(struct ksmbd_file *fp)
opinfo = rcu_dereference(fp->f_opinfo);
rcu_read_unlock();
if (!opinfo->is_lease || opinfo->o_lease->version != 2)
if (!opinfo || !opinfo->is_lease || opinfo->o_lease->version != 2)
return;
p_ci = ksmbd_inode_lookup_lock(fp->filp->f_path.dentry->d_parent);