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drm/dp: Don't trust drm_dp_downstream_id()
author
Chris Wilson
<chris@chris-wilson.co.uk>
Thu, 20 Jul 2017 17:45:32 +0000
(18:45 +0100)
committer
Jani Nikula
<jani.nikula@intel.com>
Fri, 21 Jul 2017 14:45:26 +0000
(17:45 +0300)
Before we interpret drm_dp_downstream_id() as a string, make sure it is
NULL terminated, even when drm_dp_downtsream_id() fails.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101660
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link:
https://patchwork.freedesktop.org/patch/msgid/20170720174532.23377-2-chris@chris-wilson.co.uk
drivers/gpu/drm/drm_dp_helper.c
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diff --git
a/drivers/gpu/drm/drm_dp_helper.c
b/drivers/gpu/drm/drm_dp_helper.c
index
1d9e30f
..
08af8d6
100644
(file)
--- a/
drivers/gpu/drm/drm_dp_helper.c
+++ b/
drivers/gpu/drm/drm_dp_helper.c
@@
-544,7
+544,7
@@
void drm_dp_downstream_debug(struct seq_file *m,
DP_DETAILED_CAP_INFO_AVAILABLE;
int clk;
int bpc;
- char id[
6
];
+ char id[
7
];
int len;
uint8_t rev[2];
int type = port_cap[0] & DP_DS_PORT_TYPE_MASK;
@@
-583,6
+583,7
@@
void drm_dp_downstream_debug(struct seq_file *m,
seq_puts(m, "\t\tType: N/A\n");
}
+ memset(id, 0, sizeof(id));
drm_dp_downstream_id(aux, id);
seq_printf(m, "\t\tID: %s\n", id);