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cifs_get_link(): bail out in unsafe case

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->d_revalidate() bails out there, anyway.  It's not enough
to prevent getting into ->get_link() in RCU mode, but that
could happen only in a very contrieved setup.  Not worth
trying to do anything fancy here unless ->d_revalidate()
stops kicking out of RCU mode at least in some cases.

Reviewed-by: Christian Brauner <brauner@kernel.org>
Acked-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2023-09-19 22:28:16 -04:00
parent 053fc4f755
commit 0511fdb4a3
1 changed files with 3 additions and 0 deletions
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3
fs/smb/client/cifsfs.c
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@ -1172,6 +1172,9 @@ const char *cifs_get_link(struct dentry *dentry, struct inode *inode,
{
char *target_path;
if (!dentry)
return ERR_PTR(-ECHILD);
target_path = kmalloc(PATH_MAX, GFP_KERNEL);
if (!target_path)
return ERR_PTR(-ENOMEM);