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authorDan Carpenter <dan.carpenter@oracle.com>2013-12-05 18:53:50 +0400
committerBrian Norris <computersforpeace@gmail.com>2014-03-11 09:42:21 +0400
commitb4c233057771581698a13694ab6f33b48ce837dc (patch)
tree6d74a193de02e9e531bcc3981e15373dd49894fa /drivers/mtd/sm_ftl.c
parentf5e00838e83f6fc93f42c7a01b0c612031955b31 (diff)
downloadlinux-b4c233057771581698a13694ab6f33b48ce837dc.tar.xz
mtd: sm_ftl: heap corruption in sm_create_sysfs_attributes()
We always put a NUL terminator one space past the end of the "vendor" buffer. Walter Harms also pointed out that this should just use kstrndup(). Fixes: 7d17c02a01a1 ('mtd: Add new SmartMedia/xD FTL') Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd/sm_ftl.c')
-rw-r--r--drivers/mtd/sm_ftl.c11
1 files changed, 4 insertions, 7 deletions
diff --git a/drivers/mtd/sm_ftl.c b/drivers/mtd/sm_ftl.c
index 4b8e89583f2a..cf49c22673b9 100644
--- a/drivers/mtd/sm_ftl.c
+++ b/drivers/mtd/sm_ftl.c
@@ -59,15 +59,12 @@ static struct attribute_group *sm_create_sysfs_attributes(struct sm_ftl *ftl)
struct attribute_group *attr_group;
struct attribute **attributes;
struct sm_sysfs_attribute *vendor_attribute;
+ char *vendor;
- int vendor_len = strnlen(ftl->cis_buffer + SM_CIS_VENDOR_OFFSET,
- SM_SMALL_PAGE - SM_CIS_VENDOR_OFFSET);
-
- char *vendor = kmalloc(vendor_len, GFP_KERNEL);
+ vendor = kstrndup(ftl->cis_buffer + SM_CIS_VENDOR_OFFSET,
+ SM_SMALL_PAGE - SM_CIS_VENDOR_OFFSET, 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 =
@@ -78,7 +75,7 @@ static struct attribute_group *sm_create_sysfs_attributes(struct sm_ftl *ftl)
sysfs_attr_init(&vendor_attribute->dev_attr.attr);
vendor_attribute->data = vendor;
- vendor_attribute->len = vendor_len;
+ vendor_attribute->len = strlen(vendor);
vendor_attribute->dev_attr.attr.name = "vendor";
vendor_attribute->dev_attr.attr.mode = S_IRUGO;
vendor_attribute->dev_attr.show = sm_attr_show;