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lib/iscsi: return immediately from iscsi_parse_params if len is 0

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The spec does not disallow TEXT PDUs with no data.  In that
case, just return immediately from iscsi_parse_params.

This avoids a NULL pointer dereference with a TEXT PDU that has
no data, but CONTINUE flag is set.

Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Signed-off-by: Jim Harris <james.r.harris@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/6319 (master)

(cherry picked from commit f3fd56fc3c)
Change-Id: I2605293daf171633a45132d7b5532fdfc9128aff
Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/6601
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Tomasz Zawadzki 2021-02-08 10:28:44 -05:00
parent f2a113d144
commit a5a51c7b56
3 changed files with 56 additions and 0 deletions
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10
lib/iscsi/param.c
View File

@ -315,6 +315,16 @@ iscsi_parse_params(struct iscsi_param **params, const uint8_t *data,
char *p;
int i;
/* Spec does not disallow TEXT PDUs with zero length, just return
* immediately in that case, since there is no param data to parse
* and any existing partial parameter would remain as-is.
*/
if (len == 0) {
return 0;
}
assert(data != NULL);
/* strip the partial text parameters if previous PDU have C enabled */
if (partial_parameter && *partial_parameter) {
for (i = 0; i < len && data[i] != '\0'; i++) {

38
test/unit/lib/iscsi/iscsi.c/iscsi_ut.c
View File

@ -1993,6 +1993,43 @@ pdu_hdr_op_data_test(void)
g_task_pool_is_empty = false;
}
/* Test an ISCSI_OP_TEXT PDU with CONTINUE bit set but
* no data.
*/
static void
empty_text_with_cbit_test(void)
{
struct spdk_iscsi_sess sess = {};
struct spdk_iscsi_conn conn = {};
struct spdk_scsi_dev dev = {};
struct spdk_iscsi_pdu *req_pdu;
int rc;
req_pdu = iscsi_get_pdu(&conn);
sess.ExpCmdSN = 0;
sess.MaxCmdSN = 64;
sess.session_type = SESSION_TYPE_NORMAL;
sess.MaxBurstLength = 1024;
conn.full_feature = 1;
conn.sess = &sess;
conn.dev = &dev;
conn.state = ISCSI_CONN_STATE_RUNNING;
memset(&req_pdu->bhs, 0, sizeof(req_pdu->bhs));
req_pdu->bhs.opcode = ISCSI_OP_TEXT;
req_pdu->bhs.flags = ISCSI_TEXT_CONTINUE;
rc = iscsi_pdu_hdr_handle(&conn, req_pdu);
CU_ASSERT(rc == 0);
CU_ASSERT(!req_pdu->is_rejected);
rc = iscsi_pdu_payload_handle(&conn, req_pdu);
CU_ASSERT(rc == 0);
iscsi_put_pdu(req_pdu);
}
int
main(int argc, char **argv)
{
@ -2024,6 +2061,7 @@ main(int argc, char **argv)
CU_ADD_TEST(suite, pdu_hdr_op_task_mgmt_test);
CU_ADD_TEST(suite, pdu_hdr_op_nopout_test);
CU_ADD_TEST(suite, pdu_hdr_op_data_test);
CU_ADD_TEST(suite, empty_text_with_cbit_test);
CU_basic_set_mode(CU_BRM_VERBOSE);
CU_basic_run_tests();

8
test/unit/lib/iscsi/param.c/param_ut.c
View File

@ -264,6 +264,14 @@ parse_valid_test(void)
EXPECT_VAL("F", "IIII");
CU_ASSERT_PTR_NULL(partial_parameter);
/* partial parameter: NULL data */
/* It is technically allowed to have a TEXT PDU with no data, yet
* CONTINUE bit is enabled - make sure we handle that case correctly.
*/
rc = iscsi_parse_params(&params, NULL, 0, true, &partial_parameter);
CU_ASSERT(rc == 0);
CU_ASSERT_PTR_NULL(partial_parameter);
/* Second partial parameter is the only parameter */
PARSE("OOOO", true, &partial_parameter);
CU_ASSERT_STRING_EQUAL(partial_parameter, "OOOO");