ISDN: Fix data access out of array bounds
Fix against access random data bytes outside the dev->chanmap array.
Thanks to Oliver Neukum for pointing me to this issue.
Signed-off-by: Karsten Keil <kkeil@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/isdn/i4l/isdn_common.c b/drivers/isdn/i4l/isdn_common.c
index ec5f404..4910bca 100644
--- a/drivers/isdn/i4l/isdn_common.c
+++ b/drivers/isdn/i4l/isdn_common.c
@@ -1135,7 +1135,7 @@
if (count > dev->drv[drvidx]->stavail)
count = dev->drv[drvidx]->stavail;
len = dev->drv[drvidx]->interface->readstat(buf, count,
- drvidx, isdn_minor2chan(minor));
+ drvidx, isdn_minor2chan(minor - ISDN_MINOR_CTRL));
if (len < 0) {
retval = len;
goto out;
@@ -1207,7 +1207,8 @@
*/
if (dev->drv[drvidx]->interface->writecmd)
retval = dev->drv[drvidx]->interface->
- writecmd(buf, count, drvidx, isdn_minor2chan(minor));
+ writecmd(buf, count, drvidx,
+ isdn_minor2chan(minor - ISDN_MINOR_CTRL));
else
retval = count;
goto out;