mtd: sm_rtl: check kmalloc return value

Because malloc/kzalloc may fail, we should check kmalloc/kzalloc return value
 in sm_create_sysfs_attributes(), mtd/sm_rtl.c and do error handling.
Meanwhile, we should check sm_create_sysfs_attributes return value.

Signed-off-by: Xiaochen Wang <wangxiaochen0@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/mtd/sm_ftl.c b/drivers/mtd/sm_ftl.c
index 67822cf6c025..6405a95dc5bd 100644
--- a/drivers/mtd/sm_ftl.c
+++ b/drivers/mtd/sm_ftl.c
@@ -64,12 +64,16 @@ struct attribute_group *sm_create_sysfs_attributes(struct sm_ftl *ftl)
                                         SM_SMALL_PAGE - SM_CIS_VENDOR_OFFSET);
 
         char *vendor = kmalloc(vendor_len, GFP_KERNEL);
+        if (!vendor)
+                goto error1;
         memcpy(vendor, ftl->cis_buffer + SM_CIS_VENDOR_OFFSET, vendor_len);
         vendor[vendor_len] = 0;
 
         /* Initialize sysfs attributes */
         vendor_attribute =
                 kzalloc(sizeof(struct sm_sysfs_attribute), GFP_KERNEL);
+        if (!vendor_attribute)
+                goto error2;
 
         sysfs_attr_init(&vendor_attribute->dev_attr.attr);
 
@@ -83,12 +87,24 @@ struct attribute_group *sm_create_sysfs_attributes(struct sm_ftl *ftl)
         /* Create array of pointers to the attributes */
         attributes = kzalloc(sizeof(struct attribute *) * (NUM_ATTRIBUTES + 1),
                                                                 GFP_KERNEL);
+        if (!attributes)
+                goto error3;
         attributes[0] = &vendor_attribute->dev_attr.attr;
 
         /* Finally create the attribute group */
         attr_group = kzalloc(sizeof(struct attribute_group), GFP_KERNEL);
+        if (!attr_group)
+                goto error4;
         attr_group->attrs = attributes;
         return attr_group;
+error4:
+        kfree(attributes);
+error3:
+        kfree(vendor_attribute);
+error2:
+        kfree(vendor);
+error1:
+        return NULL;
 }
 
 void sm_delete_sysfs_attributes(struct sm_ftl *ftl)
@@ -1178,6 +1194,8 @@ static void sm_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
         }
 
         ftl->disk_attributes = sm_create_sysfs_attributes(ftl);
+        if (!ftl->disk_attributes)
+                goto error6;
         trans->disk_attributes = ftl->disk_attributes;
 
         sm_printk("Found %d MiB xD/SmartMedia FTL on mtd%d",