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| author | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2014-09-24 15:35:55 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2014-09-26 06:47:55 -0300 |
| commit | 64e01cbd9d3e22e38eadeff9e0d251d0d7d1c9d2 (patch) | |
| tree | eef9c68d65d7e6e08c65512dbb0a7314dcf77e10 /drivers/media | |
| parent | 5a9ff85dc176e80c6fb7067dcb807c5e3ff7a913 (diff) | |
| download | linux-64e01cbd9d3e22e38eadeff9e0d251d0d7d1c9d2.tar.bz2 | |
[media] pms: Fix a bad usage of the stack
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@osg.samsung.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/parport/pms.c | 7 |
1 files changed, 6 insertions, 1 deletions
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; } |