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keys, dns: Fix size check of V1 server-list header

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commit acc657692a 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: 1997b3cb42 ("keys, dns: Fix missing size check of V1 server-list header")
Reported-by: Pengfei Xu <pengfei.xu@intel.com>
Link: https://lore.kernel.org/r/ZZ4fyY4r3rqgZL+4@xpf.sh.intel.com/
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Howells 2024-01-10 21:11:40 +00:00 committed by Greg Kroah-Hartman
parent 60a9a5fca6
commit 66b3578797
1 changed files with 1 additions and 1 deletions
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2
net/dns_resolver/dns_key.c
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@ -104,7 +104,7 @@ dns_resolver_preparse(struct key_preparsed_payload *prep)
const struct dns_server_list_v1_header *v1;
/* It may be a server list. */
if (datalen <= sizeof(*v1))
if (datalen < sizeof(*v1))
return -EINVAL;
v1 = (const struct dns_server_list_v1_header *)data;