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Commit f7e1dd8e authored by Daniel Rosenberg's avatar Daniel Rosenberg Committed by Greg Kroah-Hartman
Browse files

HID: debug: check length before copy_to_user() 



commit 717adfdaf14704fd3ec7fa2c04520c0723247eac upstream.

If our length is greater than the size of the buffer, we
overflow the buffer

Cc: stable@vger.kernel.org
Signed-off-by: default avatarDaniel Rosenberg <drosen@google.com>
Reviewed-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5fe18b3d

drivers/hid/hid-debug.c

+7 −1
Original line number Diff line number Diff line
@@ -1150,6 +1150,8 @@ copy_rest: 
			goto out;

		if (list->tail > list->head) {

			len = list->tail - list->head;

			if (len > count)

				len = count;



			if (copy_to_user(buffer + ret, &list->hid_debug_buf[list->head], len)) {

				ret = -EFAULT;
@@ -1159,6 +1161,8 @@ copy_rest: 
			list->head += len;

		} else {

			len = HID_DEBUG_BUFSIZE - list->head;

			if (len > count)

				len = count;



			if (copy_to_user(buffer, &list->hid_debug_buf[list->head], len)) {

				ret = -EFAULT;
@@ -1166,6 +1170,8 @@ copy_rest: 
			}

			list->head = 0;

			ret += len;

			count -= len;

			if (count > 0)

				goto copy_rest;

		}