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smb: client: add NULL check in automount_fullpath

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page is checked for null in __build_path_from_dentry_optional_prefix
when tcon->origin_fullpath is not set. However, the check is missing when
it is set.
Add a check to prevent a potential NULL pointer dereference.

Signed-off-by: Ruben Devos <devosruben6@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ruben Devos 2025-06-01 19:18:55 +02:00 committed by Steve French
parent 55423e9c53
commit f1e7a277a1
1 changed files with 3 additions and 0 deletions
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3
fs/smb/client/namespace.c
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@ -146,6 +146,9 @@ static char *automount_fullpath(struct dentry *dentry, void *page)
} }
spin_unlock(&tcon->tc_lock); spin_unlock(&tcon->tc_lock);
if (unlikely(!page))
return ERR_PTR(-ENOMEM);
s = dentry_path_raw(dentry, page, PATH_MAX); s = dentry_path_raw(dentry, page, PATH_MAX);
if (IS_ERR(s)) if (IS_ERR(s))
return s; return s;