4.9-stable review patch. If anyone has any objections, please let me know.
------------------
[ Upstream commit c7a082e4242fd8cd21a441071e622f87c16bdacc ]
UBSAN reported those with MegaRAID SAS-3 3108,
[ 77.467308] UBSAN: Undefined behaviour in drivers/scsi/megaraid/megaraid_sas_fp.c:117:32 [ 77.475402] index 255 is out of range for type 'MR_LD_SPAN_MAP [1]' [ 77.481677] CPU: 16 PID: 333 Comm: kworker/16:1 Not tainted 4.20.0-rc5+ #1 [ 77.488556] Hardware name: Huawei TaiShan 2280 /BC11SPCD, BIOS 1.50 06/01/2018 [ 77.495791] Workqueue: events work_for_cpu_fn [ 77.500154] Call trace: [ 77.502610] dump_backtrace+0x0/0x2c8 [ 77.506279] show_stack+0x24/0x30 [ 77.509604] dump_stack+0x118/0x19c [ 77.513098] ubsan_epilogue+0x14/0x60 [ 77.516765] __ubsan_handle_out_of_bounds+0xfc/0x13c [ 77.521767] mr_update_load_balance_params+0x150/0x158 [megaraid_sas] [ 77.528230] MR_ValidateMapInfo+0x2cc/0x10d0 [megaraid_sas] [ 77.533825] megasas_get_map_info+0x244/0x2f0 [megaraid_sas] [ 77.539505] megasas_init_adapter_fusion+0x9b0/0xf48 [megaraid_sas] [ 77.545794] megasas_init_fw+0x1ab4/0x3518 [megaraid_sas] [ 77.551212] megasas_probe_one+0x2c4/0xbe0 [megaraid_sas] [ 77.556614] local_pci_probe+0x7c/0xf0 [ 77.560365] work_for_cpu_fn+0x34/0x50 [ 77.564118] process_one_work+0x61c/0xf08 [ 77.568129] worker_thread+0x534/0xa70 [ 77.571882] kthread+0x1c8/0x1d0 [ 77.575114] ret_from_fork+0x10/0x1c
[ 89.240332] UBSAN: Undefined behaviour in drivers/scsi/megaraid/megaraid_sas_fp.c:117:32 [ 89.248426] index 255 is out of range for type 'MR_LD_SPAN_MAP [1]' [ 89.254700] CPU: 16 PID: 95 Comm: kworker/u130:0 Not tainted 4.20.0-rc5+ #1 [ 89.261665] Hardware name: Huawei TaiShan 2280 /BC11SPCD, BIOS 1.50 06/01/2018 [ 89.268903] Workqueue: events_unbound async_run_entry_fn [ 89.274222] Call trace: [ 89.276680] dump_backtrace+0x0/0x2c8 [ 89.280348] show_stack+0x24/0x30 [ 89.283671] dump_stack+0x118/0x19c [ 89.287167] ubsan_epilogue+0x14/0x60 [ 89.290835] __ubsan_handle_out_of_bounds+0xfc/0x13c [ 89.295828] MR_LdRaidGet+0x50/0x58 [megaraid_sas] [ 89.300638] megasas_build_io_fusion+0xbb8/0xd90 [megaraid_sas] [ 89.306576] megasas_build_and_issue_cmd_fusion+0x138/0x460 [megaraid_sas] [ 89.313468] megasas_queue_command+0x398/0x3d0 [megaraid_sas] [ 89.319222] scsi_dispatch_cmd+0x1dc/0x8a8 [ 89.323321] scsi_request_fn+0x8e8/0xdd0 [ 89.327249] __blk_run_queue+0xc4/0x158 [ 89.331090] blk_execute_rq_nowait+0xf4/0x158 [ 89.335449] blk_execute_rq+0xdc/0x158 [ 89.339202] __scsi_execute+0x130/0x258 [ 89.343041] scsi_probe_and_add_lun+0x2fc/0x1488 [ 89.347661] __scsi_scan_target+0x1cc/0x8c8 [ 89.351848] scsi_scan_channel.part.3+0x8c/0xc0 [ 89.356382] scsi_scan_host_selected+0x130/0x1f0 [ 89.361002] do_scsi_scan_host+0xd8/0xf0 [ 89.364927] do_scan_async+0x9c/0x320 [ 89.368594] async_run_entry_fn+0x138/0x420 [ 89.372780] process_one_work+0x61c/0xf08 [ 89.376793] worker_thread+0x13c/0xa70 [ 89.380546] kthread+0x1c8/0x1d0 [ 89.383778] ret_from_fork+0x10/0x1c
This is because when populating Driver Map using firmware raid map, all non-existing VDs set their ldTgtIdToLd to 0xff, so it can be skipped later.
From drivers/scsi/megaraid/megaraid_sas_base.c ,
memset(instance->ld_ids, 0xff, MEGASAS_MAX_LD_IDS);
From drivers/scsi/megaraid/megaraid_sas_fp.c ,
/* For non existing VDs, iterate to next VD*/ if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1)) continue;
However, there are a few places that failed to skip those non-existing VDs due to off-by-one errors. Then, those 0xff leaked into MR_LdRaidGet(0xff, map) and triggered the out-of-bound accesses.
Fixes: 51087a8617fe ("megaraid_sas : Extended VD support") Signed-off-by: Qian Cai cai@lca.pw Acked-by: Sumit Saxena sumit.saxena@broadcom.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/megaraid/megaraid_sas_fp.c | 2 +- drivers/scsi/megaraid/megaraid_sas_fusion.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/megaraid/megaraid_sas_fp.c b/drivers/scsi/megaraid/megaraid_sas_fp.c index e413113c86ac..663d8f503c86 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fp.c +++ b/drivers/scsi/megaraid/megaraid_sas_fp.c @@ -1275,7 +1275,7 @@ void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) { ld = MR_TargetIdToLdGet(ldCount, drv_map); - if (ld >= MAX_LOGICAL_DRIVES_EXT) { + if (ld >= MAX_LOGICAL_DRIVES_EXT - 1) { lbInfo[ldCount].loadBalanceFlag = 0; continue; } diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c index f722a0e6caa4..fe1a20973e47 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c @@ -1902,7 +1902,7 @@ static void megasas_build_ld_nonrw_fusion(struct megasas_instance *instance, device_id < instance->fw_supported_vd_count)) {
ld = MR_TargetIdToLdGet(device_id, local_map_ptr); - if (ld >= instance->fw_supported_vd_count) + if (ld >= instance->fw_supported_vd_count - 1) fp_possible = 0;
raid = MR_LdRaidGet(ld, local_map_ptr);