From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Mon, 6 May 2019 12:50:18 +0000 (+0300)
Subject: kdb: do a sanity check on the cpu in kdb_per_cpu()
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=bfe9388e57f525d10a556ac476f55a4143f68413;hp=15e94dd34af65b4a16857a572bab54893df5321d;p=sagit-ice-cold%2Fkernel_xiaomi_msm8998.git

kdb: do a sanity check on the cpu in kdb_per_cpu()

[ Upstream commit b586627e10f57ee3aa8f0cfab0d6f7dc4ae63760 ]

The "whichcpu" comes from argv[3].  The cpu_online() macro looks up the
cpu in a bitmap of online cpus, but if the value is too high then it
could read beyond the end of the bitmap and possibly Oops.

Fixes: 5d5314d6795f ("kdb: core for kgdb back end (1 of 2)")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index ebc52c7bd8a6..cba287a5c976 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -2632,7 +2632,7 @@ static int kdb_per_cpu(int argc, const char **argv)
 		diag = kdbgetularg(argv[3], &whichcpu);
 		if (diag)
 			return diag;
-		if (!cpu_online(whichcpu)) {
+		if (whichcpu >= nr_cpu_ids || !cpu_online(whichcpu)) {
 			kdb_printf("cpu %ld is not online\n", whichcpu);
 			return KDB_BADCPUNUM;
 		}