tree eed185aafd345a302f05711c3e6d5d80fca7c3f9
parent 0baa57d8dc32db78369d8b5176ef56c5e2e18ab3
author Ben Hutchings <ben@decadent.org.uk> 1446394973 +0000
committer David S. Miller <davem@davemloft.net> 1446499500 -0500

ppp, slip: Validate VJ compression slot parameters completely

Currently slhc_init() treats out-of-range values of rslots and tslots
as equivalent to 0, except that if tslots is too large it will
dereference a null pointer (CVE-2015-7799).

Add a range-check at the top of the function and make it return an
ERR_PTR() on error instead of NULL.  Change the callers accordingly.

Compile-tested only.

Reported-by: 郭永刚 <guoyonggang@360.cn>
References: http://article.gmane.org/gmane.comp.security.oss.general/17908
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>