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selinux: set next pointer before attaching to list 

commit 70d91dc9b2 upstream.

Set the next pointer in filename_trans_read_helper() before attaching
the new node under construction to the list, otherwise garbage would be
dereferenced on subsequent failure during cleanup in the out goto label.

Cc: <stable@vger.kernel.org>
Fixes: 4300590243 ("selinux: implement new format of filename transitions")
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Göttsche 2023-08-18 17:33:58 +02:00 committed by Greg Kroah-Hartman
parent 36c5aecc78
commit d6b64d710e
1 changed files with 1 additions and 1 deletions
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2
security/selinux/ss/policydb.c
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@ -2005,6 +2005,7 @@ static int filename_trans_read_helper(struct policydb *p, void *fp)
if (!datum) if (!datum)
goto out; goto out;
datum->next = NULL;
*dst = datum; *dst = datum;
/* ebitmap_read() will at least init the bitmap */ /* ebitmap_read() will at least init the bitmap */
@ -2017,7 +2018,6 @@ static int filename_trans_read_helper(struct policydb *p, void *fp)
goto out; goto out;
datum->otype = le32_to_cpu(buf[0]); datum->otype = le32_to_cpu(buf[0]);
datum->next = NULL;
dst = &datum->next; dst = &datum->next;
} }