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iscsi: Fix the bug to add wrong size in _iscsi_sgl_append_with_md

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This bug was found by code inspection. When PDU read restarts
after data segment, iov_offset must be reduced by data length.
However iov_offset had been reduced by buffer length by mistake.

Lack of UT code was the main reason of this bug. Hence add UT
code to test the fix of the bug together in this patch.

Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Change-Id: I74f2f6ae8dca2e78a64bfdef8080c8031dfabb87
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/458530
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
This commit is contained in:
Shuhei Matsumoto 2019-06-19 10:08:17 +09:00 committed by Changpeng Liu
parent f240e2bf48
commit beefcd1ae5
2 changed files with 77 additions and 1 deletions
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2
lib/iscsi/iscsi.c
View File

@ -636,7 +636,7 @@ _iscsi_sgl_append_with_md(struct _iscsi_sgl *s,
struct iovec buf_iov;
if (s->iov_offset >= data_len) {
s->iov_offset -= buf_len;
s->iov_offset -= data_len;
} else {
buf_iov.iov_base = buf;
buf_iov.iov_len = buf_len;

76
test/unit/lib/iscsi/iscsi.c/iscsi_ut.c
View File

@ -1440,6 +1440,81 @@ build_iovs_test(void)
free(data);
}
static void
build_iovs_with_md_test(void)
{
struct spdk_iscsi_conn conn = {};
struct spdk_iscsi_pdu pdu = {};
struct iovec iovs[6] = {};
uint8_t *data;
uint32_t mapped_length = 0;
int rc;
conn.header_digest = true;
conn.data_digest = true;
DSET24(&pdu.bhs.data_segment_len, 4096 * 2);
data = calloc(1, (4096 + 128) * 2);
SPDK_CU_ASSERT_FATAL(data != NULL);
pdu.data = data;
pdu.data_buf_len = (4096 + 128) * 2;
pdu.bhs.total_ahs_len = 0;
pdu.bhs.opcode = ISCSI_OP_SCSI;
rc = spdk_dif_ctx_init(&pdu.dif_ctx, 4096 + 128, 128, true, false, SPDK_DIF_TYPE1,
0, 0, 0, 0, 0, 0);
CU_ASSERT(rc == 0);
pdu.dif_insert_or_strip = true;
pdu.writev_offset = 0;
rc = spdk_iscsi_build_iovs(&conn, iovs, 6, &pdu, &mapped_length);
CU_ASSERT(rc == 5);
CU_ASSERT(iovs[0].iov_base == (void *)&pdu.bhs);
CU_ASSERT(iovs[0].iov_len == ISCSI_BHS_LEN);
CU_ASSERT(iovs[1].iov_base == (void *)pdu.header_digest);
CU_ASSERT(iovs[1].iov_len == ISCSI_DIGEST_LEN);
CU_ASSERT(iovs[2].iov_base == (void *)pdu.data);
CU_ASSERT(iovs[2].iov_len == 4096);
CU_ASSERT(iovs[3].iov_base == (void *)(pdu.data + 4096 + 128));
CU_ASSERT(iovs[3].iov_len == 4096);
CU_ASSERT(iovs[4].iov_base == (void *)pdu.data_digest);
CU_ASSERT(iovs[4].iov_len == ISCSI_DIGEST_LEN);
CU_ASSERT(mapped_length == ISCSI_BHS_LEN + ISCSI_DIGEST_LEN + 4096 * 2 + ISCSI_DIGEST_LEN);
pdu.writev_offset = ISCSI_BHS_LEN + ISCSI_DIGEST_LEN + 2048;
rc = spdk_iscsi_build_iovs(&conn, iovs, 6, &pdu, &mapped_length);
CU_ASSERT(rc == 3);
CU_ASSERT(iovs[0].iov_base == (void *)(pdu.data + 2048));
CU_ASSERT(iovs[0].iov_len == 2048);
CU_ASSERT(iovs[1].iov_base == (void *)(pdu.data + 4096 + 128));
CU_ASSERT(iovs[1].iov_len == 4096);
CU_ASSERT(iovs[2].iov_base == (void *)pdu.data_digest);
CU_ASSERT(iovs[2].iov_len == ISCSI_DIGEST_LEN);
CU_ASSERT(mapped_length == 2048 + 4096 + ISCSI_DIGEST_LEN);
pdu.writev_offset = ISCSI_BHS_LEN + ISCSI_DIGEST_LEN + 4096 * 2;
rc = spdk_iscsi_build_iovs(&conn, iovs, 6, &pdu, &mapped_length);
CU_ASSERT(rc == 1);
CU_ASSERT(iovs[0].iov_base == (void *)pdu.data_digest);
CU_ASSERT(iovs[0].iov_len == ISCSI_DIGEST_LEN);
CU_ASSERT(mapped_length == ISCSI_DIGEST_LEN);
pdu.writev_offset = 0;
rc = spdk_iscsi_build_iovs(&conn, iovs, 3, &pdu, &mapped_length);
CU_ASSERT(rc == 3);
CU_ASSERT(iovs[0].iov_base == (void *)&pdu.bhs);
CU_ASSERT(iovs[0].iov_len == ISCSI_BHS_LEN);
CU_ASSERT(iovs[1].iov_base == (void *)pdu.header_digest);
CU_ASSERT(iovs[1].iov_len == ISCSI_DIGEST_LEN);
CU_ASSERT(iovs[2].iov_base == (void *)pdu.data);
CU_ASSERT(iovs[2].iov_len == 4096);
CU_ASSERT(mapped_length == ISCSI_BHS_LEN + ISCSI_DIGEST_LEN + 4096);
free(data);
}
int
main(int argc, char **argv)
{
@ -1478,6 +1553,7 @@ main(int argc, char **argv)
|| CU_add_test(suite, "abort_queued_datain_tasks_test",
abort_queued_datain_tasks_test) == NULL
|| CU_add_test(suite, "build_iovs_test", build_iovs_test) == NULL
|| CU_add_test(suite, "build_iovs_with_md_test", build_iovs_with_md_test) == NULL
) {
CU_cleanup_registry();
return CU_get_error();