6.6-stable review patch. If anyone has any objections, please let me know.
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From: Su Hui suhui@nfschina.com
[ Upstream commit a3bdcdd022c68942a774e8e63424cc11c85aab78 ]
'struct hidraw_list' is a circular queue whose head can be smaller than tail. Using 'list->tail != list->head' to release all memory that should be released.
Fixes: a5623a203cff ("HID: hidraw: fix memory leak in hidraw_release()") Signed-off-by: Su Hui suhui@nfschina.com Reviewed-by: Dan Carpenter dan.carpenter@linaro.org Signed-off-by: Jiri Kosina jkosina@suse.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hid/hidraw.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c index 13c8dd8cd350..2bc762d31ac7 100644 --- a/drivers/hid/hidraw.c +++ b/drivers/hid/hidraw.c @@ -357,8 +357,11 @@ static int hidraw_release(struct inode * inode, struct file * file) down_write(&minors_rwsem);
spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags); - for (int i = list->tail; i < list->head; i++) - kfree(list->buffer[i].value); + while (list->tail != list->head) { + kfree(list->buffer[list->tail].value); + list->buffer[list->tail].value = NULL; + list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1); + } list_del(&list->node); spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); kfree(list);