[ Upstream commit 5dd6c49339126c2c8df2179041373222362d6e49 ] 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 <[email protected]> Reviewed-by: Chris Leech <[email protected]> Signed-off-by: Martin K. Petersen <[email protected]> Signed-off-by: Sasha Levin <[email protected]> --- drivers/target/iscsi/iscsi_target_auth.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/target/iscsi/iscsi_target_auth.c b/drivers/target/iscsi/iscsi_target_auth.c index 4e680d753941..e2fa3a3bc81d 100644 --- a/drivers/target/iscsi/iscsi_target_auth.c +++ b/drivers/target/iscsi/iscsi_target_auth.c @@ -89,6 +89,12 @@ static int chap_check_algorithm(const char *a_str) 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, -- 2.20.1
