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target/iscsi: avoid NULL dereference in CHAP auth error path

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commit ce512d79d0466a604793addb6b769d12ee326822 upstream.

If chap_server_compute_md5() fails early, e.g. via CHAP_N mismatch, then
crypto_free_shash() is called with a NULL pointer which gets
dereferenced in crypto_shash_tfm().

Fixes: 69110e3cedbb ("iscsi-target: Use shash and ahash")
Suggested-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: David Disseldorp <ddiss@suse.de>
Cc: stable@vger.kernel.org # 4.6+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Disseldorp 2017-12-13 18:22:30 +01:00 committed by Greg Kroah-Hartman
parent 28130f4d23
commit fffc0fcaeb
1 changed files with 2 additions and 1 deletions
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3
drivers/target/iscsi/iscsi_target_auth.c
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@ -413,7 +413,8 @@ static int chap_server_compute_md5(
auth_ret = 0;
out:
kzfree(desc);
crypto_free_shash(tfm);
if (tfm)
crypto_free_shash(tfm);
kfree(challenge);
kfree(challenge_binhex);
return auth_ret;