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KEYS: fix key refcount leak in keyctl_read_key()

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In keyctl_read_key(), if key_permission() were to return an error code
other than EACCES, we would leak a the reference to the key.  This can't
actually happen currently because key_permission() can only return an
error code other than EACCES if security_key_permission() does, only
SELinux and Smack implement that hook, and neither can return an error
code other than EACCES.  But it should still be fixed, as it is a bug
waiting to happen.

Fixes: 29db919063 ("[PATCH] Keys: Add LSM hooks for key management [try #3]")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Eric Biggers 2017-09-18 11:36:31 -07:00 committed by David Howells
parent 884bee0215
commit 7fc0786d95
1 changed files with 1 additions and 1 deletions
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security/keys/keyctl.c
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@ -771,7 +771,7 @@ long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen)
if (ret == 0)
goto can_read_key;
if (ret != -EACCES)
goto error;
goto error2;
/* we can't; see if it's searchable from this process's keyrings
* - we automatically take account of the fact that it may be