fs/namespace: correctly handle errors returned by grab_requested_mnt_ns

grab_requested_mnt_ns was changed to return error codes on failure, but
its callers were not updated to check for error pointers, still checking
only for a NULL return value.

This commit updates the callers to use IS_ERR() or IS_ERR_OR_NULL() and
PTR_ERR() to correctly check for and propagate errors.

This also makes sure that the logic actually works and mount namespace
file descriptors can be used to refere to mounts.

Christian Brauner <[email protected]> says:

Rework the patch to be more ergonomic and in line with our overall error
handling patterns.

Fixes: 7b9d14af8777 ("fs: allow mount namespace fd")
Cc: Christian Brauner <[email protected]>
Signed-off-by: Andrei Vagin <[email protected]>
Link: https://patch.msgid.link/[email protected]
Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>

0 files changed, 0 insertions, 0 deletions