Commit d39d5ed9 authored by Karsten Keil's avatar Karsten Keil Committed by Linus Torvalds

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: default avatarKarsten Keil <kkeil@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e46dc1da
......@@ -1135,7 +1135,7 @@ isdn_read(struct file *file, char __user *buf, size_t count, loff_t * off)
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 @@ isdn_write(struct file *file, const char __user *buf, size_t count, loff_t * off
*/
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;
......
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