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lightnvm: protect target type list with correct locks
nvm_tgt_types list was protected by wrong lock for NVM_INFO ioctl call
and can race with addition or removal of target types. Also
unregistering target type was not protected correctly.
Fixes: 5cd907853
("lightnvm: remove nested lock conflict with mm")
Signed-off-by: Rakesh Pandit <rakesh@tuxera.com>
Reviewed-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
parent
bb6aa6f082
commit
88d31ea267
@ -589,9 +589,9 @@ void nvm_unregister_tgt_type(struct nvm_tgt_type *tt)
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if (!tt)
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return;
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down_write(&nvm_lock);
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down_write(&nvm_tgtt_lock);
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list_del(&tt->list);
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up_write(&nvm_lock);
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up_write(&nvm_tgtt_lock);
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}
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EXPORT_SYMBOL(nvm_unregister_tgt_type);
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@ -1195,7 +1195,7 @@ static long nvm_ioctl_info(struct file *file, void __user *arg)
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info->version[1] = NVM_VERSION_MINOR;
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info->version[2] = NVM_VERSION_PATCH;
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down_write(&nvm_lock);
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down_write(&nvm_tgtt_lock);
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list_for_each_entry(tt, &nvm_tgt_types, list) {
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struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
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@ -1208,7 +1208,7 @@ static long nvm_ioctl_info(struct file *file, void __user *arg)
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}
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info->tgtsize = tgt_iter;
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up_write(&nvm_lock);
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up_write(&nvm_tgtt_lock);
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if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
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kfree(info);
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