[PATCH] video: fbdev: via: check the return value of kstrdup()

[xkernel.wang at foxmail.com]

From: Xiaoke Wang <xkernel.wang at foxmail.com>

kstrdup() is a memory allocation function which can return NULL when
some internal memory errors happen. It is better to check the return
value of it to catch the error in time during the setup of viafb.

Signed-off-by: Xiaoke Wang <xkernel.wang at foxmail.com>
---
 drivers/video/fbdev/via/viafbdev.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/video/fbdev/via/viafbdev.c b/drivers/video/fbdev/via/viafbdev.c
index 22deb34..2d67c92 100644
--- a/drivers/video/fbdev/via/viafbdev.c
+++ b/drivers/video/fbdev/via/viafbdev.c
@@ -1939,8 +1939,12 @@ static int __init viafb_setup(void)
 
 		if (!strncmp(this_opt, "viafb_mode1=", 12)) {
 			viafb_mode1 = kstrdup(this_opt + 12, GFP_KERNEL);
+			if (!viafb_mode1)
+				return -ENOMEM;
 		} else if (!strncmp(this_opt, "viafb_mode=", 11)) {
 			viafb_mode = kstrdup(this_opt + 11, GFP_KERNEL);
+			if (!viafb_mode)
+				return -ENOMEM;
 		} else if (!strncmp(this_opt, "viafb_bpp1=", 11)) {
 			if (kstrtouint(this_opt + 11, 0, &viafb_bpp1) < 0)
 				return -EINVAL;
@@ -1969,6 +1973,8 @@ static int __init viafb_setup(void)
 				return -EINVAL;
 		} else if (!strncmp(this_opt, "viafb_active_dev=", 17)) {
 			viafb_active_dev = kstrdup(this_opt + 17, GFP_KERNEL);
+			if (!viafb_active_dev)
+				return -ENOMEM;
 		} else if (!strncmp(this_opt,
 			"viafb_display_hardware_layout=", 30)) {
 			if (kstrtoint(this_opt + 30, 0,
@@ -1995,8 +2001,12 @@ static int __init viafb_setup(void)
 				return -EINVAL;
 		} else if (!strncmp(this_opt, "viafb_lcd_port=", 15)) {
 			viafb_lcd_port = kstrdup(this_opt + 15, GFP_KERNEL);
+			if (!viafb_lcd_port)
+				return -ENOMEM;
 		} else if (!strncmp(this_opt, "viafb_dvi_port=", 15)) {
 			viafb_dvi_port = kstrdup(this_opt + 15, GFP_KERNEL);
+			if (!viafb_dvi_port)
+				return -ENOMEM;
 		}
 	}
 	return 0;
--