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Message-Id: <20220809175514.029299291@linuxfoundation.org>
Date: Tue, 9 Aug 2022 20:00:21 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, stable <stable@...nel.org>,
Ning Qiang <sohu0106@....com>,
Kees Cook <keescook@...omium.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.19 30/32] macintosh/adb: fix oob read in do_adb_query() function
From: Ning Qiang <sohu0106@....com>
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@...nel.org>
Signed-off-by: Ning Qiang <sohu0106@....com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20220713153734.2248-1-sohu0106@126.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/macintosh/adb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/macintosh/adb.c
+++ b/drivers/macintosh/adb.c
@@ -645,7 +645,7 @@ 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;
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