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

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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>
This commit is contained in:
David Howells 2024-01-10 21:11:40 +00:00 committed by Linus Torvalds
parent 0cb552aa97
commit acc657692a
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;