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[PATCH] sound/oss/emu10k1: handle userspace copy errors 

Propagate copy_to/from_user() errors back through callers.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jeff Garzik 2006-12-06 20:35:34 -08:00 committed by Linus Torvalds
parent 91046a8a69
commit e45f467610
4 changed files with 38 additions and 16 deletions
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8
sound/oss/emu10k1/audio.c
View File

@ -111,9 +111,15 @@ static ssize_t emu10k1_audio_read(struct file *file, char __user *buffer, size_t
if ((bytestocopy >= wiinst->buffer.fragment_size)
|| (bytestocopy >= count)) {
int rc;
bytestocopy = min_t(u32, bytestocopy, count);
emu10k1_wavein_xferdata(wiinst, (u8 __user *)buffer, &bytestocopy);
rc = emu10k1_wavein_xferdata(wiinst,
(u8 __user *)buffer,
&bytestocopy);
if (rc)
return rc;
count -= bytestocopy;
buffer += bytestocopy;

31
sound/oss/emu10k1/cardwi.c
View File

@ -304,11 +304,12 @@ void emu10k1_wavein_getxfersize(struct wiinst *wiinst, u32 * size)
}
}
static void copy_block(u8 __user *dst, u8 * src, u32 str, u32 len, u8 cov)
static int copy_block(u8 __user *dst, u8 * src, u32 str, u32 len, u8 cov)
{
if (cov == 1)
__copy_to_user(dst, src + str, len);
else {
if (cov == 1) {
if (__copy_to_user(dst, src + str, len))
return -EFAULT;
} else {
u8 byte;
u32 i;
@ -316,22 +317,26 @@ static void copy_block(u8 __user *dst, u8 * src, u32 str, u32 len, u8 cov)
for (i = 0; i < len; i++) {
byte = src[2 * i] ^ 0x80;
__copy_to_user(dst + i, &byte, 1);
if (__copy_to_user(dst + i, &byte, 1))
return -EFAULT;
}
}
return 0;
}
void emu10k1_wavein_xferdata(struct wiinst *wiinst, u8 __user *data, u32 * size)
int emu10k1_wavein_xferdata(struct wiinst *wiinst, u8 __user *data, u32 * size)
{
struct wavein_buffer *buffer = &wiinst->buffer;
u32 sizetocopy, sizetocopy_now, start;
unsigned long flags;
int ret;
sizetocopy = min_t(u32, buffer->size, *size);
*size = sizetocopy;
if (!sizetocopy)
return;
return 0;
spin_lock_irqsave(&wiinst->lock, flags);
start = buffer->pos;
@ -345,11 +350,17 @@ void emu10k1_wavein_xferdata(struct wiinst *wiinst, u8 __user *data, u32 * size)
if (sizetocopy > sizetocopy_now) {
sizetocopy -= sizetocopy_now;
copy_block(data, buffer->addr, start, sizetocopy_now, buffer->cov);
copy_block(data + sizetocopy_now, buffer->addr, 0, sizetocopy, buffer->cov);
ret = copy_block(data, buffer->addr, start, sizetocopy_now,
buffer->cov);
if (ret == 0)
ret = copy_block(data + sizetocopy_now, buffer->addr, 0,
sizetocopy, buffer->cov);
} else {
copy_block(data, buffer->addr, start, sizetocopy, buffer->cov);
ret = copy_block(data, buffer->addr, start, sizetocopy,
buffer->cov);
}
return ret;
}
void emu10k1_wavein_update(struct emu10k1_card *card, struct wiinst *wiinst)

2
sound/oss/emu10k1/cardwi.h
View File

@ -83,7 +83,7 @@ void emu10k1_wavein_close(struct emu10k1_wavedevice *);
void emu10k1_wavein_start(struct emu10k1_wavedevice *);
void emu10k1_wavein_stop(struct emu10k1_wavedevice *);
void emu10k1_wavein_getxfersize(struct wiinst *, u32 *);
void emu10k1_wavein_xferdata(struct wiinst *, u8 __user *, u32 *);
int emu10k1_wavein_xferdata(struct wiinst *, u8 __user *, u32 *);
int emu10k1_wavein_setformat(struct emu10k1_wavedevice *, struct wave_format *);
void emu10k1_wavein_update(struct emu10k1_card *, struct wiinst *);

13
sound/oss/emu10k1/passthrough.c
View File

@ -162,12 +162,15 @@ ssize_t emu10k1_pt_write(struct file *file, const char __user *buffer, size_t co
DPD(3, "prepend size %d, prepending %d bytes\n", pt->prepend_size, needed);
if (count < needed) {
copy_from_user(pt->buf + pt->prepend_size, buffer, count);
if (copy_from_user(pt->buf + pt->prepend_size,
buffer, count))
return -EFAULT;
pt->prepend_size += count;
DPD(3, "prepend size now %d\n", pt->prepend_size);
return count;
}
copy_from_user(pt->buf + pt->prepend_size, buffer, needed);
if (copy_from_user(pt->buf + pt->prepend_size, buffer, needed))
return -EFAULT;
r = pt_putblock(wave_dev, (u16 *) pt->buf, nonblock);
if (r)
return r;
@ -178,7 +181,8 @@ ssize_t emu10k1_pt_write(struct file *file, const char __user *buffer, size_t co
blocks_copied = 0;
while (blocks > 0) {
u16 __user *bufptr = (u16 __user *) buffer + (bytes_copied/2);
copy_from_user(pt->buf, bufptr, PT_BLOCKSIZE);
if (copy_from_user(pt->buf, bufptr, PT_BLOCKSIZE))
return -EFAULT;
r = pt_putblock(wave_dev, (u16 *)pt->buf, nonblock);
if (r) {
if (bytes_copied)
@ -193,7 +197,8 @@ ssize_t emu10k1_pt_write(struct file *file, const char __user *buffer, size_t co
i = count - bytes_copied;
if (i) {
pt->prepend_size = i;
copy_from_user(pt->buf, buffer + bytes_copied, i);
if (copy_from_user(pt->buf, buffer + bytes_copied, i))
return -EFAULT;
bytes_copied += i;
DPD(3, "filling prepend buffer with %d bytes", i);
}