diff options
| author | Andrew Gabbasov <andrew_gabbasov@mentor.com> | 2017-09-30 08:54:52 -0700 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-10-11 13:14:37 +0300 |
| commit | ff74745e6d3d97a865eda8c1f3fd29c13b79f0cc (patch) | |
| tree | 0959465100e5db6f960de31cca0d0cf36381b6f2 /drivers/usb/gadget/configfs.c | |
| parent | aec17e1e249567e82b26dafbb86de7d07fde8729 (diff) | |
usb: gadget: configfs: Fix memory leak of interface directory data
Kmemleak checking configuration reports a memory leak in
usb_os_desc_prepare_interf_dir function when rndis function
instance is freed and then allocated again. For example, this
happens with FunctionFS driver with RNDIS function enabled
when "ffs-test" test application is run several times in a row.
The data for intermediate "os_desc" group for interface directories
is allocated as a single VLA chunk and (after a change of default
groups handling) is not ever freed and actually not stored anywhere
besides inside a list of default groups of a parent group.
The fix is to make usb_os_desc_prepare_interf_dir function return
a pointer to allocated data (as a pointer to the first VLA item)
instead of (an unused) integer and to make the caller component
(currently the only one is RNDIS function) responsible for storing
the pointer and freeing the memory when appropriate.
Fixes: 1ae1602de028 ("configfs: switch ->default groups to a linked list")
Cc: stable@vger.kernel.org
Signed-off-by: Andrew Gabbasov <andrew_gabbasov@mentor.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/gadget/configfs.c')
| -rw-r--r-- | drivers/usb/gadget/configfs.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c index a22a892de7b7..aeb9f3c40521 100644 --- a/drivers/usb/gadget/configfs.c +++ b/drivers/usb/gadget/configfs.c @@ -1143,11 +1143,12 @@ static struct configfs_attribute *interf_grp_attrs[] = { NULL }; -int usb_os_desc_prepare_interf_dir(struct config_group *parent, - int n_interf, - struct usb_os_desc **desc, - char **names, - struct module *owner) +struct config_group *usb_os_desc_prepare_interf_dir( + struct config_group *parent, + int n_interf, + struct usb_os_desc **desc, + char **names, + struct module *owner) { struct config_group *os_desc_group; struct config_item_type *os_desc_type, *interface_type; @@ -1159,7 +1160,7 @@ int usb_os_desc_prepare_interf_dir(struct config_group *parent, char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); if (!vlabuf) - return -ENOMEM; + return ERR_PTR(-ENOMEM); os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group); os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type); @@ -1184,7 +1185,7 @@ int usb_os_desc_prepare_interf_dir(struct config_group *parent, configfs_add_default_group(&d->group, os_desc_group); } - return 0; + return os_desc_group; } EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir); |