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authorGustavo A. R. Silva <gustavo@embeddedor.com>2017-08-11 20:55:15 -0500
committerDaniel Vetter <daniel.vetter@ffwll.ch>2017-08-18 09:10:46 +0200
commit3c2c42eb47f2e2272e0cc244751cd312e18d5142 (patch)
treecf6b9382823e50bd1ec6d8eacf0148199e55cff4 /drivers/gpu/drm/gma500
parentf3bbc908e87384785c26b6fa71d1c0beb126797c (diff)
downloadlinux-3c2c42eb47f2e2272e0cc244751cd312e18d5142.tar.bz2
drm/gma500: fix potential NULL pointer dereference dereference
NULL check at line 528: if (!sender || !data_out || !len_out) {, implies that pointer _sender_ might be NULL. Move pointer _sender_ dereference after NULL check in order to avoid a potential NULL pointer dereference. This issue was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20170812015515.GA8360@embeddedgus
Diffstat (limited to 'drivers/gpu/drm/gma500')
-rw-r--r--drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c b/drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c
index 1616af209bfc..c50534c923df 100644
--- a/drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c
+++ b/drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c
@@ -520,7 +520,7 @@ static int __read_panel_data(struct mdfld_dsi_pkg_sender *sender, u8 data_type,
u8 *data, u16 len, u32 *data_out, u16 len_out, bool hs)
{
unsigned long flags;
- struct drm_device *dev = sender->dev;
+ struct drm_device *dev;
int i;
u32 gen_data_reg;
int retry = MDFLD_DSI_READ_MAX_COUNT;
@@ -530,6 +530,8 @@ static int __read_panel_data(struct mdfld_dsi_pkg_sender *sender, u8 data_type,
return -EINVAL;
}
+ dev = sender->dev;
+
/**
* do reading.
* 0) send out generic read request