This is a note to let you know that I've just added the patch titled
macintosh/adb: fix oob read in do_adb_query() function
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
macintosh-adb-fix-oob-read-in-do_adb_query-function.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 91f5770eac36c7a3cd49c6b5c81e702ac538f28b
Author: Ning Qiang <sohu0106@xxxxxxx>
Date: Wed Jul 13 23:37:34 2022 +0800
macintosh/adb: fix oob read in do_adb_query() function
commit fd97e4ad6d3b0c9fce3bca8ea8e6969d9ce7423b upstream.
In do_adb_query() function of drivers/macintosh/adb.c, req->data is copied
form userland. The parameter "req->data[2]" is missing check, the array
size of adb_handler[] is 16, so adb_handler[req->data[2]].original_address and
adb_handler[req->data[2]].handler_id will lead to oob read.
Cc: stable <stable@xxxxxxxxxx>
Signed-off-by: Ning Qiang <sohu0106@xxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Acked-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220713153734.2248-1-sohu0106@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
diff --git a/drivers/macintosh/adb.c b/drivers/macintosh/adb.c
index 226179b975a0..1f5db323e5a5 100644
--- a/drivers/macintosh/adb.c
+++ b/drivers/macintosh/adb.c
@@ -650,7 +650,7 @@ do_adb_query(struct adb_request *req)
switch(req->data[1]) {
case ADB_QUERY_GETDEVINFO:
- if (req->nbytes < 3)
+ if (req->nbytes < 3 || req->data[2] >= 16)
break;
mutex_lock(&adb_handler_mutex);
req->reply[0] = adb_handler[req->data[2]].original_address;
