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[PATCH] ISDN: check for userspace copy faults

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Most of the ISDN ->readstat() implementations needed to check
copy_to_user() and put_user() return values.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
Cc: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jeff Garzik 2006-10-17 00:10:40 -07:00 committed by Linus Torvalds
parent 04518bfe8e
commit 7786ce192f
5 changed files with 20 additions and 11 deletions
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3
drivers/isdn/capi/capidrv.c
View file

@ -1907,7 +1907,8 @@ static int if_readstat(u8 __user *buf, int len, int id, int channel)
}
for (p=buf, count=0; count < len; p++, count++) {
put_user(*card->q931_read++, p);
if (put_user(*card->q931_read++, p))
return -EFAULT;
if (card->q931_read > card->q931_end)
card->q931_read = card->q931_buf;
}

6
drivers/isdn/hisax/config.c
View file

@ -631,7 +631,8 @@ static int HiSax_readstatus(u_char __user *buf, int len, int id, int channel)
count = cs->status_end - cs->status_read + 1;
if (count >= len)
count = len;
copy_to_user(p, cs->status_read, count);
if (copy_to_user(p, cs->status_read, count))
return -EFAULT;
cs->status_read += count;
if (cs->status_read > cs->status_end)
cs->status_read = cs->status_buf;
@ -642,7 +643,8 @@ static int HiSax_readstatus(u_char __user *buf, int len, int id, int channel)
cnt = HISAX_STATUS_BUFSIZE;
else
cnt = count;
copy_to_user(p, cs->status_read, cnt);
if (copy_to_user(p, cs->status_read, cnt))
return -EFAULT;
p += cnt;
cs->status_read += cnt % HISAX_STATUS_BUFSIZE;
count -= cnt;

3
drivers/isdn/icn/icn.c
View file

@ -1010,7 +1010,8 @@ icn_readstatus(u_char __user *buf, int len, icn_card * card)
for (p = buf, count = 0; count < len; p++, count++) {
if (card->msg_buf_read == card->msg_buf_write)
return count;
put_user(*card->msg_buf_read++, p);
if (put_user(*card->msg_buf_read++, p))
return -EFAULT;
if (card->msg_buf_read > card->msg_buf_end)
card->msg_buf_read = card->msg_buf;
}

3
drivers/isdn/isdnloop/isdnloop.c
View file

@ -446,7 +446,8 @@ isdnloop_readstatus(u_char __user *buf, int len, isdnloop_card * card)
for (p = buf, count = 0; count < len; p++, count++) {
if (card->msg_buf_read == card->msg_buf_write)
return count;
put_user(*card->msg_buf_read++, p);
if (put_user(*card->msg_buf_read++, p))
return -EFAULT;
if (card->msg_buf_read > card->msg_buf_end)
card->msg_buf_read = card->msg_buf;
}

16
drivers/isdn/pcbit/drv.c
View file

@ -725,23 +725,27 @@ static int pcbit_stat(u_char __user *buf, int len, int driver, int channel)
if (stat_st < stat_end)
{
copy_to_user(buf, statbuf + stat_st, len);
if (copy_to_user(buf, statbuf + stat_st, len))
return -EFAULT;
stat_st += len;
}
else
{
if (len > STATBUF_LEN - stat_st)
{
copy_to_user(buf, statbuf + stat_st,
STATBUF_LEN - stat_st);
copy_to_user(buf, statbuf,
len - (STATBUF_LEN - stat_st));
if (copy_to_user(buf, statbuf + stat_st,
STATBUF_LEN - stat_st))
return -EFAULT;
if (copy_to_user(buf, statbuf,
len - (STATBUF_LEN - stat_st)))
return -EFAULT;
stat_st = len - (STATBUF_LEN - stat_st);
}
else
{
copy_to_user(buf, statbuf + stat_st, len);
if (copy_to_user(buf, statbuf + stat_st, len))
return -EFAULT;
stat_st += len;