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Commit 4ab42d78 authored by Ben Hutchings's avatar Ben Hutchings Committed by David S. Miller
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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: default avatar郭永刚 <guoyonggang@360.cn>
References: http://article.gmane.org/gmane.comp.security.oss.general/17908


Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0baa57d8
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