From: Chaitanya Kulkarni Date: Fri, 2 Jun 2023 05:37:13 +0000 (-0700) Subject: nvme-fabrics: error out to unlock the mutex X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=900095bfbbf6623fbfa9e5ceb3982f293b6f3275;p=linux.git nvme-fabrics: error out to unlock the mutex Currently, in the nvmf_host_add() function, if the nvmf_host_alloc() call failed to allocate memory for the host, the code would directly return -ENOMEM without unlocking the nvmf_hosts_mutex. This could lead to potential issues with mutex synchronization. Fix that error handling mechanism by jumping to the out_unlock label when nvmf_host_alloc() fails. This ensures that the mutex is unlocked before returning the error code. The updated code enhances avoids possible deadlocks. Fixes: f0cebf82004d ("nvme-fabrics: prevent overriding of existing host") Reported-by: kernel test robot Reported-by: Julia Lawall Closes: https://lore.kernel.org/r/202306020909.MTUEBeIa-lkp@intel.com/ Signed-off-by: Chaitanya Kulkarni Reviewed-by: Julia Lawall Reviewed-by: Sagi Grimberg Reviewed-by: Max Gurtovoy Reviewed-by: Christoph Hellwig Signed-off-by: Keith Busch --- diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c index b1fa27b609173..c4345d1d98aa9 100644 --- a/drivers/nvme/host/fabrics.c +++ b/drivers/nvme/host/fabrics.c @@ -92,8 +92,10 @@ static struct nvmf_host *nvmf_host_add(const char *hostnqn, uuid_t *id) } host = nvmf_host_alloc(hostnqn, id); - if (!host) - return ERR_PTR(-ENOMEM); + if (!host) { + host = ERR_PTR(-ENOMEM); + goto out_unlock; + } list_add_tail(&host->list, &nvmf_hosts); out_unlock: