As warned by smatch:
drivers/media/parport/pms.c:632:21: warning: Variable length array is used.
The pms driver is doing something really bad: it is using the
stack to read data into a buffer whose size is given by the
user by the read() syscall. Replace it by a dynamically allocated
buffer.
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
diff --git a/drivers/media/parport/pms.c b/drivers/media/parport/pms.c
index 9bc105b3db1b..e6b497528cea 100644
--- a/drivers/media/parport/pms.c
+++ b/drivers/media/parport/pms.c
@@ -629,11 +629,15 @@ static int pms_capture(struct pms *dev, char __user *buf, int rgb555, int count)
{
int y;
int dw = 2 * dev->width;
- char tmp[dw + 32]; /* using a temp buffer is faster than direct */
+ char *tmp; /* using a temp buffer is faster than direct */
int cnt = 0;
int len = 0;
unsigned char r8 = 0x5; /* value for reg8 */
+ tmp = kmalloc(dw + 32, GFP_KERNEL);
+ if (!tmp)
+ return 0;
+
if (rgb555)
r8 |= 0x20; /* else use untranslated rgb = 565 */
mvv_write(dev, 0x08, r8); /* capture rgb555/565, init DRAM, PC enable */
@@ -664,6 +668,7 @@ static int pms_capture(struct pms *dev, char __user *buf, int rgb555, int count)
len += dt;
}
}
+ kfree(tmp);
return len;
}
--
1.9.3
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