[PATCH] ISDN: check for userspace copy faults
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>
diff --git a/drivers/isdn/capi/capidrv.c b/drivers/isdn/capi/capidrv.c
index d10c8b8..b6f9476 100644
--- a/drivers/isdn/capi/capidrv.c
+++ b/drivers/isdn/capi/capidrv.c
@@ -1907,7 +1907,8 @@
}
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;
}