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Aldo Ariel Panzardo
2ec28c09b3
__vsock_net_mode_string() returns success without updating new_mode when
the transfer length is zero. Its caller then reads the uninitialized enum
and may permanently store a stack-derived value in the write-once child
mode.
Return before calling __vsock_net_mode_string() when *lenp is zero so
that the helper is never invoked with nothing to parse and new_mode is
never read uninitialized. This also prevents an empty write from
locking the current mode.
Fixes: eafb64f40c ("vsock: add netns to vsock core")
Cc: [email protected]
Reviewed-by: Luigi Leonardi <[email protected]>
Signed-off-by: Aldo Ariel Panzardo <[email protected]>
Reviewed-by: Stefano Garzarella <[email protected]>
Reviewed-by: Bobby Eshleman <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>