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irda: Only insert new objects into the global database via setsockopt 

The irda_setsockopt() function conditionally allocates memory for a new
self->ias_object or, in some cases, reuses the existing
self->ias_object. Existing objects were incorrectly reinserted into the
LM_IAS database which corrupted the doubly linked list used for the
hashbin implementation of the LM_IAS database. When combined with a
memory leak in irda_bind(), this issue could be leveraged to create a
use-after-free vulnerability in the hashbin list. This patch fixes the
issue by only inserting newly allocated objects into the database.

CVE-2018-6555

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Reviewed-by: Seth Arnold <seth.arnold@canonical.com>
Reviewed-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tyler Hicks 2018-09-04 15:24:05 +00:00 committed by Greg Kroah-Hartman
parent 4a7811bb3a
commit 131a3b82c8
1 changed files with 5 additions and 1 deletions
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6
net/irda/af_irda.c
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@ -2027,7 +2027,11 @@ static int irda_setsockopt(struct socket *sock, int level, int optname,
err = -EINVAL;
goto out;
}
irias_insert_object(ias_obj);
/* Only insert newly allocated objects */
if (free_ias)
irias_insert_object(ias_obj);
kfree(ias_opt);
break;
case IRLMP_IAS_DEL: