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authorMatias Bjørling <m@bjorling.me>2016-05-06 21:02:59 +0300
committerJens Axboe <axboe@fb.com>2016-05-06 21:51:10 +0300
commit7f7c5d03c0e8e177d1ed1c6412ae035e8eff35de (patch)
tree1a354500001df077c63e14ba63c29fc43d375fcf /drivers/lightnvm
parent22e8c9766a669d49cf3749d397082a5cd93374a9 (diff)
downloadlinux-7f7c5d03c0e8e177d1ed1c6412ae035e8eff35de.tar.xz
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>
Diffstat (limited to 'drivers/lightnvm')
-rw-r--r--drivers/lightnvm/core.c53
1 files changed, 30 insertions, 23 deletions
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 4cadbe0cd537..74fb049e0b83 100644
--- 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);