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Message-ID: <20240508135148.v4.2.Iadb65b8add19ed3ae3ed6425011beb97e380a912@changeid>
Date: Wed, 8 May 2024 13:51:44 -0700
From: Douglas Anderson <dianders@...omium.org>
To: dri-devel@...ts.freedesktop.org
Cc: lvzhaoxiong@...qin.corp-partner.google.com,
Jani Nikula <jani.nikula@...ux.intel.com>,
Hsin-Yi Wang <hsinyi@...gle.com>,
Linus Walleij <linus.walleij@...aro.org>,
Javier Martinez Canillas <javierm@...hat.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Cong Yang <yangcong5@...qin.corp-partner.google.com>,
Sam Ravnborg <sam@...nborg.org>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Joel Selvaraj <jo@...amily.in>,
Brian Norris <briannorris@...omium.org>,
Douglas Anderson <dianders@...omium.org>,
Daniel Vetter <daniel@...ll.ch>,
David Airlie <airlied@...il.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
linux-kernel@...r.kernel.org
Subject: [PATCH v4 2/9] drm/mipi-dsi: Fix theoretical int overflow in mipi_dsi_generic_write_seq()
The mipi_dsi_generic_write_seq() macro makes a call to
mipi_dsi_generic_write() which returns a type ssize_t. The macro then
stores it in an int and checks to see if it's negative. This could
theoretically be a problem if "ssize_t" is larger than "int".
To see the issue, imagine that "ssize_t" is 32-bits and "int" is
16-bits, you could see a problem if there was some code out there that
looked like:
mipi_dsi_generic_write_seq(dsi, <32768 bytes as arguments>);
..since we'd get back that 32768 bytes were transferred and 32768
stored in a 16-bit int would look negative.
Though there are no callsites where we'd actually hit this (even if
"int" was only 16-bit), it's cleaner to make the types match so let's
fix it.
Fixes: a9015ce59320 ("drm/mipi-dsi: Add a mipi_dsi_dcs_write_seq() macro")
Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---
(no changes since v3)
Changes in v3:
- Use %zd in print instead of casting errors to int.
Changes in v2:
- New
include/drm/drm_mipi_dsi.h | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 70ce0b8cbc68..e0f56564bf97 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -314,17 +314,17 @@ int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi,
* @dsi: DSI peripheral device
* @seq: buffer containing the payload
*/
-#define mipi_dsi_generic_write_seq(dsi, seq...) \
- do { \
- static const u8 d[] = { seq }; \
- struct device *dev = &dsi->dev; \
- int ret; \
- ret = mipi_dsi_generic_write(dsi, d, ARRAY_SIZE(d)); \
- if (ret < 0) { \
- dev_err_ratelimited(dev, "transmit data failed: %d\n", \
- ret); \
- return ret; \
- } \
+#define mipi_dsi_generic_write_seq(dsi, seq...) \
+ do { \
+ static const u8 d[] = { seq }; \
+ struct device *dev = &dsi->dev; \
+ ssize_t ret; \
+ ret = mipi_dsi_generic_write(dsi, d, ARRAY_SIZE(d)); \
+ if (ret < 0) { \
+ dev_err_ratelimited(dev, "transmit data failed: %zd\n", \
+ ret); \
+ return ret; \
+ } \
} while (0)
/**
--
2.45.0.rc1.225.g2a3ae87e7f-goog
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