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authorMauro Carvalho Chehab <mchehab+samsung@kernel.org>2018-05-15 15:31:38 +0300
committerMauro Carvalho Chehab <mchehab+samsung@kernel.org>2018-05-16 17:17:22 +0300
commit4f5ab5d7a5e765ad231a132f82cec71de88b9aad (patch)
tree9a326c770e388b1b2ddc19dcc109fe299d8a5dac /drivers/media/dvb-core
parent782b9d201112ae526a823ddba522c88c761585c7 (diff)
downloadlinux-4f5ab5d7a5e765ad231a132f82cec71de88b9aad.tar.xz
media: dvb_ca_en50221: prevent using slot_info for Spectre attacs
slot can be controlled by user-space, hence leading to a potential exploitation of the Spectre variant 1 vulnerability, as warned by smatch: drivers/media/dvb-core/dvb_ca_en50221.c:1479 dvb_ca_en50221_io_write() warn: potential spectre issue 'ca->slot_info' (local cap) Acked-by: "Jasmin J." <jasmin@anw.at> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media/dvb-core')
-rw-r--r--drivers/media/dvb-core/dvb_ca_en50221.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/media/dvb-core/dvb_ca_en50221.c b/drivers/media/dvb-core/dvb_ca_en50221.c
index 97365a863519..1310526b0d49 100644
--- a/drivers/media/dvb-core/dvb_ca_en50221.c
+++ b/drivers/media/dvb-core/dvb_ca_en50221.c
@@ -31,6 +31,7 @@
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/module.h>
+#include <linux/nospec.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
@@ -1476,6 +1477,7 @@ static ssize_t dvb_ca_en50221_io_write(struct file *file,
if (slot >= ca->slot_count)
return -EINVAL;
+ slot = array_index_nospec(slot, ca->slot_count);
sl = &ca->slot_info[slot];
/* check if the slot is actually running */