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Commit 4533e762 authored by David Howells's avatar David Howells Committed by Greg Kroah-Hartman
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keys, dns: Fix size check of V1 server-list header



commit acc65769 upstream.

Fix the size check added to dns_resolver_preparse() for the V1 server-list
header so that it doesn't give EINVAL if the size supplied is the same as
the size of the header struct (which should be valid).

This can be tested with:

        echo -n -e '\0\0\01\xff\0\0' | keyctl padd dns_resolver desc @p

which will give "add_key: Invalid argument" without this fix.

Fixes: 1997b3cb ("keys, dns: Fix missing size check of V1 server-list header")
Reported-by: default avatarPengfei Xu <pengfei.xu@intel.com>
Link: https://lore.kernel.org/r/ZZ4fyY4r3rqgZL+4@xpf.sh.intel.com/


Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Cc: Petr Vorel <pvorel@suse.cz>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9e8a31c1
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