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keys: Reuse keyring_index_key::desc_len in lookup_user_key()

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When lookup_user_key() checks whether the key is possessed, it should
use the key's existing index_key including the 'desc_len' field, rather
than recomputing the 'desc_len'.  This doesn't change the behavior; this
way is just simpler and faster.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jamorris@linux.microsoft.com>
This commit is contained in:
Eric Biggers 2019-05-29 14:01:52 -07:00 committed by David Howells
parent f7f1394576
commit 4754620865
1 changed files with 1 additions and 3 deletions
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security/keys/process_keys.c
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@ -688,9 +688,7 @@ key_ref_t lookup_user_key(key_serial_t id, unsigned long lflags,
key_ref = make_key_ref(key, 0);
/* check to see if we possess the key */
ctx.index_key.type = key->type;
ctx.index_key.description = key->description;
ctx.index_key.desc_len = strlen(key->description);
ctx.index_key = key->index_key;
ctx.match_data.raw_data = key;
kdebug("check possessed");
skey_ref = search_process_keyrings(&ctx);