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USB: dwc3: fix memory leak with using debugfs_lookup()

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[ Upstream commit be308d68785b205e483b3a0c61ba3a82da468f2c ]

When calling debugfs_lookup() the result must have dput() called on it,
otherwise the memory will leak over time.  To make things simpler, just
call debugfs_lookup_and_remove() instead which handles all of the logic
at once.

Note, the root dentry for the debugfs directory for the device needs to
be saved so we don't have to keep looking it up, which required a bit
more refactoring to properly create and remove it when needed.

Reported-by: Bruce Chen <bruce.chen@unisoc.com>
Reported-by: Cixi Geng <cixi.geng1@unisoc.com>
Tested-by: Cixi Geng <gengcixi@gmail.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20230202152820.2409908-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Greg Kroah-Hartman 2023-02-02 16:28:20 +01:00
parent baec889a81
commit cf52c320cf
4 changed files with 14 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/usb/dwc3/core.h
View File

@ -1092,6 +1092,7 @@ struct dwc3_scratchpad_array {
* address.
* @num_ep_resized: carries the current number endpoints which have had its tx
* fifo resized.
* @debug_root: root debugfs directory for this device to put its files in.
*/
struct dwc3 {
struct work_struct drd_work;
@ -1303,6 +1304,7 @@ struct dwc3 {
int max_cfg_eps;
int last_fifo_depth;
int num_ep_resized;
struct dentry *debug_root;
};
#define INCRX_BURST_MODE 0

3
drivers/usb/dwc3/debug.h
View File

@ -414,11 +414,14 @@ static inline const char *dwc3_gadget_generic_cmd_status_string(int status)
#ifdef CONFIG_DEBUG_FS
extern void dwc3_debugfs_create_endpoint_dir(struct dwc3_ep *dep);
extern void dwc3_debugfs_remove_endpoint_dir(struct dwc3_ep *dep);
extern void dwc3_debugfs_init(struct dwc3 *d);
extern void dwc3_debugfs_exit(struct dwc3 *d);
#else
static inline void dwc3_debugfs_create_endpoint_dir(struct dwc3_ep *dep)
{ }
static inline void dwc3_debugfs_remove_endpoint_dir(struct dwc3_ep *dep)
{ }
static inline void dwc3_debugfs_init(struct dwc3 *d)
{ }
static inline void dwc3_debugfs_exit(struct dwc3 *d)

19
drivers/usb/dwc3/debugfs.c
View File

@ -873,27 +873,23 @@ static const struct dwc3_ep_file_map dwc3_ep_file_map[] = {
{ "GDBGEPINFO", &dwc3_ep_info_register_fops, },
};
static void dwc3_debugfs_create_endpoint_files(struct dwc3_ep *dep,
struct dentry *parent)
void dwc3_debugfs_create_endpoint_dir(struct dwc3_ep *dep)
{
struct dentry *dir;
int i;
dir = debugfs_create_dir(dep->name, dep->dwc->debug_root);
for (i = 0; i < ARRAY_SIZE(dwc3_ep_file_map); i++) {
const struct file_operations *fops = dwc3_ep_file_map[i].fops;
const char *name = dwc3_ep_file_map[i].name;
debugfs_create_file(name, 0444, parent, dep, fops);
debugfs_create_file(name, 0444, dir, dep, fops);
}
}
void dwc3_debugfs_create_endpoint_dir(struct dwc3_ep *dep)
void dwc3_debugfs_remove_endpoint_dir(struct dwc3_ep *dep)
{
struct dentry *dir;
struct dentry *root;
root = debugfs_lookup(dev_name(dep->dwc->dev), usb_debug_root);
dir = debugfs_create_dir(dep->name, root);
dwc3_debugfs_create_endpoint_files(dep, dir);
debugfs_lookup_and_remove(dep->name, dep->dwc->debug_root);
}
void dwc3_debugfs_init(struct dwc3 *dwc)
@ -911,6 +907,7 @@ void dwc3_debugfs_init(struct dwc3 *dwc)
dwc->regset->base = dwc->regs - DWC3_GLOBALS_REGS_START;
root = debugfs_create_dir(dev_name(dwc->dev), usb_debug_root);
dwc->debug_root = root;
debugfs_create_regset32("regdump", 0444, root, dwc->regset);
debugfs_create_file("lsp_dump", 0644, root, dwc, &dwc3_lsp_fops);
@ -929,6 +926,6 @@ void dwc3_debugfs_init(struct dwc3 *dwc)
void dwc3_debugfs_exit(struct dwc3 *dwc)
{
debugfs_remove(debugfs_lookup(dev_name(dwc->dev), usb_debug_root));
debugfs_lookup_and_remove(dev_name(dwc->dev), usb_debug_root);
kfree(dwc->regset);
}

4
drivers/usb/dwc3/gadget.c
View File

@ -3081,9 +3081,7 @@ static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
list_del(&dep->endpoint.ep_list);
}
debugfs_remove_recursive(debugfs_lookup(dep->name,
debugfs_lookup(dev_name(dep->dwc->dev),
usb_debug_root)));
dwc3_debugfs_remove_endpoint_dir(dep);
kfree(dep);
}
}