drbd: Add NULL check for net_conf to prevent dereference in state validation
If the net_conf pointer is NULL and the code attempts to access its fields without a check, it will lead to a null pointer dereference. Add a NULL check before dereferencing the pointer. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 44ed167d ("drbd: rcu_read_lock() and rcu_dereference() for tconn->net_conf") Cc: stable@vger.kernel.org Signed-off-by: Mikhail Lobanov <m.lobanov@rosalinux.ru> Link: https://lore.kernel.org/r/20240909133740.84297-1-m.lobanov@rosalinux.ruSigned-off-by: Jens Axboe <axboe@kernel.dk>
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