diff options
| author | Al Viro | 2008-06-22 19:20:19 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab | 2008-07-20 12:13:27 +0200 |
| commit | 947a080037c6ae47cfe5072eadbd189e3da27ecd (patch) | |
| tree | a6529d111edf7570146c6be6b524e4e84215fd07 /drivers/media/dvb/dvb-core/dvb_demux.c | |
| parent | V4L/DVB (8130): split dvb_ringbuffer dual-use functions (diff) | |
| download | kernel-qcow2-linux-947a080037c6ae47cfe5072eadbd189e3da27ecd.tar.gz kernel-qcow2-linux-947a080037c6ae47cfe5072eadbd189e3da27ecd.tar.xz kernel-qcow2-linux-947a080037c6ae47cfe5072eadbd189e3da27ecd.zip | |
V4L/DVB (8131): dmx_write: memcpy from user-supplied pointer
... copy to kernel memory first
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media/dvb/dvb-core/dvb_demux.c')
| -rw-r--r-- | drivers/media/dvb/dvb-core/dvb_demux.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/media/dvb/dvb-core/dvb_demux.c b/drivers/media/dvb/dvb-core/dvb_demux.c index 934e15fffc56..e2eca0b1fe7c 100644 --- a/drivers/media/dvb/dvb-core/dvb_demux.c +++ b/drivers/media/dvb/dvb-core/dvb_demux.c @@ -1056,16 +1056,27 @@ static int dvbdmx_close(struct dmx_demux *demux) return 0; } -static int dvbdmx_write(struct dmx_demux *demux, const char *buf, size_t count) +static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count) { struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; + void *p; if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE)) return -EINVAL; - if (mutex_lock_interruptible(&dvbdemux->mutex)) + p = kmalloc(count, GFP_USER); + if (!p) + return -ENOMEM; + if (copy_from_user(p, buf, count)) { + kfree(p); + return -EFAULT; + } + if (mutex_lock_interruptible(&dvbdemux->mutex)) { + kfree(p); return -ERESTARTSYS; - dvb_dmx_swfilter(dvbdemux, (u8 *)buf, count); + } + dvb_dmx_swfilter(dvbdemux, p, count); + kfree(p); mutex_unlock(&dvbdemux->mutex); if (signal_pending(current)) |