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scsi: iscsi: set auth_protocol back to NULL if CHAP_A value is not supported

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[ Upstream commit 5dd6c49339 ]

If the CHAP_A value is not supported, the chap_server_open() function
should free the auth_protocol pointer and set it to NULL, or we will leave
a dangling pointer around.

[   66.010905] Unsupported CHAP_A value
[   66.011660] Security negotiation failed.
[   66.012443] iSCSI Login negotiation failed.
[   68.413924] general protection fault: 0000 [#1] SMP PTI
[   68.414962] CPU: 0 PID: 1562 Comm: targetcli Kdump: loaded Not tainted 4.18.0-80.el8.x86_64 #1
[   68.416589] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
[   68.417677] RIP: 0010:__kmalloc_track_caller+0xc2/0x210

Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Reviewed-by: Chris Leech <cleech@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maurizio Lombardi 2019-06-26 19:27:34 +02:00 • committed by Greg Kroah-Hartman
commit 06e15cf5ae
1 changed files with 8 additions and 8 deletions
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16
drivers/target/iscsi/iscsi_target_auth.c
View file

@ -89,6 +89,12 @@ out:
return CHAP_DIGEST_UNKNOWN;
}
static void chap_close(struct iscsi_conn *conn)
{
kfree(conn->auth_protocol);
conn->auth_protocol = NULL;
}
static struct iscsi_chap *chap_server_open(
struct iscsi_conn *conn,
struct iscsi_node_auth *auth,
@ -126,7 +132,7 @@ static struct iscsi_chap *chap_server_open(
case CHAP_DIGEST_UNKNOWN:
default:
pr_err("Unsupported CHAP_A value\n");
kfree(conn->auth_protocol);
chap_close(conn);
return NULL;
}
@ -141,19 +147,13 @@ static struct iscsi_chap *chap_server_open(
* Generate Challenge.
*/
if (chap_gen_challenge(conn, 1, aic_str, aic_len) < 0) {
kfree(conn->auth_protocol);
chap_close(conn);
return NULL;
}
return chap;
}
static void chap_close(struct iscsi_conn *conn)
{
kfree(conn->auth_protocol);
conn->auth_protocol = NULL;
}
static int chap_server_compute_md5(
struct iscsi_conn *conn,
struct iscsi_node_auth *auth,