lightnvm: avoid memory leak when lun_map kcalloc fails

A memory leak occurs if the lower page table is initialized and the
following dev->lun_map fails on allocation.

Rearrange the initialization of lower page table to allow dev->lun_map
to fail gracefully without memory leak.

Reviewed by: Johannes Thumshirn <jthumshirn@suse.de>
Move kfree of dev->lun_map to nvm_free()
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 4cadbe0..74fb049 100644 (file)
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -504,6 +504,7 @@ static int nvm_core_init(struct nvm_dev *dev)
 {
        struct nvm_id *id = &dev->identity;
        struct nvm_id_group *grp = &id->groups[0];
+       int ret;
 
        /* device values */
        dev->nr_chnls = grp->num_ch;
@@ -522,33 +523,16 @@ static int nvm_core_init(struct nvm_dev *dev)
        dev->plane_mode = NVM_PLANE_SINGLE;
        dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size;
 
-       if (grp->mtype != 0) {
-               pr_err("nvm: memory type not supported\n");
-               return -EINVAL;
-       }
-
-       switch (grp->fmtype) {
-       case NVM_ID_FMTYPE_SLC:
-               if (nvm_init_slc_tbl(dev, grp))
-                       return -ENOMEM;
-               break;
-       case NVM_ID_FMTYPE_MLC:
-               if (nvm_init_mlc_tbl(dev, grp))
-                       return -ENOMEM;
-               break;
-       default:
-               pr_err("nvm: flash type not supported\n");
-               return -EINVAL;
-       }
-
-       if (!dev->lps_per_blk)
-               pr_info("nvm: lower page programming table missing\n");
-
        if (grp->mpos & 0x020202)
                dev->plane_mode = NVM_PLANE_DOUBLE;
        if (grp->mpos & 0x040404)
                dev->plane_mode = NVM_PLANE_QUAD;
 
+       if (grp->mtype != 0) {
+               pr_err("nvm: memory type not supported\n");
+               return -EINVAL;
+       }
+
        /* calculated values */
        dev->sec_per_pl = dev->sec_per_pg * dev->nr_planes;
        dev->sec_per_blk = dev->sec_per_pl * dev->pgs_per_blk;
@@ -560,11 +544,34 @@ static int nvm_core_init(struct nvm_dev *dev)
                                        sizeof(unsigned long), GFP_KERNEL);
        if (!dev->lun_map)
                return -ENOMEM;
+
+       switch (grp->fmtype) {
+       case NVM_ID_FMTYPE_SLC:
+               if (nvm_init_slc_tbl(dev, grp)) {
+                       ret = -ENOMEM;
+                       goto err_fmtype;
+               }
+               break;
+       case NVM_ID_FMTYPE_MLC:
+               if (nvm_init_mlc_tbl(dev, grp)) {
+                       ret = -ENOMEM;
+                       goto err_fmtype;
+               }
+               break;
+       default:
+               pr_err("nvm: flash type not supported\n");
+               ret = -EINVAL;
+               goto err_fmtype;
+       }
+
        INIT_LIST_HEAD(&dev->online_targets);
        mutex_init(&dev->mlock);
        spin_lock_init(&dev->lock);
 
        return 0;
+err_fmtype:
+       kfree(dev->lun_map);
+       return ret;
 }
 
 static void nvm_free(struct nvm_dev *dev)
@@ -576,6 +583,7 @@ static void nvm_free(struct nvm_dev *dev)
                dev->mt->unregister_mgr(dev);
 
        kfree(dev->lptbl);
+       kfree(dev->lun_map);
 }
 
 static int nvm_init(struct nvm_dev *dev)
@@ -705,7 +713,6 @@ void nvm_unregister(char *disk_name)
        up_write(&nvm_lock);
 
        nvm_exit(dev);
-       kfree(dev->lun_map);
        kfree(dev);
 }
 EXPORT_SYMBOL(nvm_unregister);