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142 lines
4.2 KiB
Diff
142 lines
4.2 KiB
Diff
From fade8b3cf37785297b4f8a9bbd13ab107208af5a Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Mon, 18 Nov 2019 16:51:22 +0100
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Subject: [PATCH] drm/modes: parse_cmdline: Fix possible reference past
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end of string
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Commit 8582e244e5fe72d2e9ace186fa8f3ed3bb4122e1 upstream.
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Before this commit, if the last option of a video=... option is for
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example "rotate" without a "=<value>" after it then delim will point to
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the terminating 0 of the string, and value which is sets to <delim + 1>
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will point one position past the end of the string.
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This commit fixes this by enforcing that the contents of delim equals '='
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as it should be for options which take a value, this check is done in a
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new drm_mode_parse_cmdline_int helper function which factors out the
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common integer parsing code for all the options which take an int.
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Acked-by: Maxime Ripard <mripard@kernel.org>
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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Link: https://patchwork.freedesktop.org/patch/msgid/20191118155134.30468-1-hdegoede@redhat.com
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---
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drivers/gpu/drm/drm_modes.c | 68 ++++++++++++++++---------------------
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1 file changed, 30 insertions(+), 38 deletions(-)
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--- a/drivers/gpu/drm/drm_modes.c
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+++ b/drivers/gpu/drm/drm_modes.c
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@@ -1568,11 +1568,34 @@ static int drm_mode_parse_cmdline_res_mo
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return 0;
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}
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+static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
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+{
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+ const char *value;
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+ char *endp;
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+
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+ /*
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+ * delim must point to the '=', otherwise it is a syntax error and
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+ * if delim points to the terminating zero, then delim + 1 wil point
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+ * past the end of the string.
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+ */
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+ if (*delim != '=')
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+ return -EINVAL;
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+
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+ value = delim + 1;
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+ *int_ret = simple_strtol(value, &endp, 10);
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+
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+ /* Make sure we have parsed something */
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+ if (endp == value)
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+ return -EINVAL;
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+
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+ return 0;
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+}
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+
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static int drm_mode_parse_cmdline_options(char *str, size_t len,
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const struct drm_connector *connector,
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struct drm_cmdline_mode *mode)
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{
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- unsigned int rotation = 0;
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+ unsigned int deg, margin, rotation = 0;
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char *sep = str;
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while ((sep = strchr(sep, ','))) {
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@@ -1588,13 +1611,7 @@ static int drm_mode_parse_cmdline_option
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}
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if (!strncmp(option, "rotate", delim - option)) {
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- const char *value = delim + 1;
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- unsigned int deg;
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-
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- deg = simple_strtol(value, &sep, 10);
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-
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- /* Make sure we have parsed something */
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- if (sep == value)
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+ if (drm_mode_parse_cmdline_int(delim, °))
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return -EINVAL;
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switch (deg) {
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@@ -1619,57 +1636,32 @@ static int drm_mode_parse_cmdline_option
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}
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} else if (!strncmp(option, "reflect_x", delim - option)) {
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rotation |= DRM_MODE_REFLECT_X;
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- sep = delim;
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} else if (!strncmp(option, "reflect_y", delim - option)) {
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rotation |= DRM_MODE_REFLECT_Y;
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- sep = delim;
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} else if (!strncmp(option, "margin_right", delim - option)) {
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- const char *value = delim + 1;
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- unsigned int margin;
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-
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- margin = simple_strtol(value, &sep, 10);
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-
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- /* Make sure we have parsed something */
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- if (sep == value)
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+ if (drm_mode_parse_cmdline_int(delim, &margin))
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return -EINVAL;
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mode->tv_margins.right = margin;
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} else if (!strncmp(option, "margin_left", delim - option)) {
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- const char *value = delim + 1;
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- unsigned int margin;
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-
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- margin = simple_strtol(value, &sep, 10);
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-
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- /* Make sure we have parsed something */
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- if (sep == value)
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+ if (drm_mode_parse_cmdline_int(delim, &margin))
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return -EINVAL;
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mode->tv_margins.left = margin;
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} else if (!strncmp(option, "margin_top", delim - option)) {
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- const char *value = delim + 1;
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- unsigned int margin;
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-
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- margin = simple_strtol(value, &sep, 10);
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-
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- /* Make sure we have parsed something */
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- if (sep == value)
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+ if (drm_mode_parse_cmdline_int(delim, &margin))
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return -EINVAL;
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mode->tv_margins.top = margin;
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} else if (!strncmp(option, "margin_bottom", delim - option)) {
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- const char *value = delim + 1;
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- unsigned int margin;
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-
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- margin = simple_strtol(value, &sep, 10);
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-
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- /* Make sure we have parsed something */
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- if (sep == value)
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+ if (drm_mode_parse_cmdline_int(delim, &margin))
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return -EINVAL;
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mode->tv_margins.bottom = margin;
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} else {
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return -EINVAL;
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}
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+ sep = delim;
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}
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if (!(rotation & DRM_MODE_ROTATE_MASK))
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