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HID: core: replace the collection tree pointers with indices

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Previously, the pointer to the parent collection was stored. If a device
exceeds 16 collections (HID_DEFAULT_NUM_COLLECTIONS), the array to store
the collections is reallocated, the pointer to the parent collection becomes
invalid.

Replace the pointers with an index-based lookup into the collections array.

Fixes: c53431eb69 ("HID: core: store the collections as a basic tree")
Reported-by: Pandruvada, Srinivas <srinivas.pandruvada@intel.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Tested-by: Kyle Pelton <kyle.d.pelton@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Peter Hutterer
2019-01-09 13:50:18 +10:00
committed by Jiri Kosina
parent cf26057a94
commit ee46967fc6
2 changed files with 23 additions and 13 deletions
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4
include/linux/hid.h
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@@ -430,7 +430,7 @@ struct hid_local {
*/
struct hid_collection {
struct hid_collection *parent;
int parent_idx; /* device->collection */
unsigned type;
unsigned usage;
unsigned level;
@@ -658,7 +658,7 @@ struct hid_parser {
unsigned int *collection_stack;
unsigned int collection_stack_ptr;
unsigned int collection_stack_size;
struct hid_collection *active_collection;
int active_collection_idx; /* device->collection */
struct hid_device *device;
unsigned int scan_flags;
};