Fix the following out-of-bounds warnings by enclosing some structure members into new structure objects upiu_req and upiu_rsp:
include/linux/fortify-string.h:20:29: warning: '__builtin_memcpy' offset [29, 48] from the object at 'treq' is out of the bounds of referenced subobject 'req_header' with type 'struct utp_upiu_header' at offset 16 [-Warray-bounds] include/linux/fortify-string.h:20:29: warning: '__builtin_memcpy' offset [61, 80] from the object at 'treq' is out of the bounds of referenced subobject 'rsp_header' with type 'struct utp_upiu_header' at offset 48 [-Warray-bounds] arch/m68k/include/asm/string.h:72:25: warning: '__builtin_memcpy' offset [29, 48] from the object at 'treq' is out of the bounds of referenced subobject 'req_header' with type 'struct utp_upiu_header' at offset 16 [-Warray-bounds] arch/m68k/include/asm/string.h:72:25: warning: '__builtin_memcpy' offset [61, 80] from the object at 'treq' is out of the bounds of referenced subobject 'rsp_header' with type 'struct utp_upiu_header' at offset 48 [-Warray-bounds] Refactor the code by making it more structured. The problem is that the original code is trying to copy data into a bunch of struct members adjacent to each other in a single call to memcpy(). Now that a new struct _upiu_req_ enclosing all those adjacent members is introduced, memcpy() doesn't overrun the length of &treq.req_header, because the address of the new struct object _upiu_req_ is used as the destination, instead. The same problem is present when memcpy() overruns the length of the source &treq.rsp_header; in this case the address of the new struct object _upiu_rsp_ is used, instead. Also, this helps with the ongoing efforts to enable -Warray-bounds and avoid confusing the compiler. Link: https://github.com/KSPP/linux/issues/109 Reported-by: kernel test robot <[email protected]> Build-tested-by: kernel test robot <[email protected]> Link: https://lore.kernel.org/lkml/60640558.lsaxik6otpwto9rv%[email protected]/ Signed-off-by: Gustavo A. R. Silva <[email protected]> --- drivers/scsi/ufs/ufshcd.c | 28 ++++++++++++++++------------ drivers/scsi/ufs/ufshci.h | 22 +++++++++++++--------- 2 files changed, 29 insertions(+), 21 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 7539a4ee9494..324eb641e66f 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -336,11 +336,15 @@ static void ufshcd_add_tm_upiu_trace(struct ufs_hba *hba, unsigned int tag, return; if (str_t == UFS_TM_SEND) - trace_ufshcd_upiu(dev_name(hba->dev), str_t, &descp->req_header, - &descp->input_param1, UFS_TSF_TM_INPUT); + trace_ufshcd_upiu(dev_name(hba->dev), str_t, + &descp->upiu_req.req_header, + &descp->upiu_req.input_param1, + UFS_TSF_TM_INPUT); else - trace_ufshcd_upiu(dev_name(hba->dev), str_t, &descp->rsp_header, - &descp->output_param1, UFS_TSF_TM_OUTPUT); + trace_ufshcd_upiu(dev_name(hba->dev), str_t, + &descp->upiu_rsp.rsp_header, + &descp->upiu_rsp.output_param1, + UFS_TSF_TM_OUTPUT); } static void ufshcd_add_uic_command_trace(struct ufs_hba *hba, @@ -6420,7 +6424,7 @@ static int __ufshcd_issue_tm_cmd(struct ufs_hba *hba, spin_lock_irqsave(host->host_lock, flags); task_tag = hba->nutrs + free_slot; - treq->req_header.dword_0 |= cpu_to_be32(task_tag); + treq->upiu_req.req_header.dword_0 |= cpu_to_be32(task_tag); memcpy(hba->utmrdl_base_addr + free_slot, treq, sizeof(*treq)); ufshcd_vops_setup_task_mgmt(hba, free_slot, tm_function); @@ -6493,16 +6497,16 @@ static int ufshcd_issue_tm_cmd(struct ufs_hba *hba, int lun_id, int task_id, treq.header.dword_2 = cpu_to_le32(OCS_INVALID_COMMAND_STATUS); /* Configure task request UPIU */ - treq.req_header.dword_0 = cpu_to_be32(lun_id << 8) | + treq.upiu_req.req_header.dword_0 = cpu_to_be32(lun_id << 8) | cpu_to_be32(UPIU_TRANSACTION_TASK_REQ << 24); - treq.req_header.dword_1 = cpu_to_be32(tm_function << 16); + treq.upiu_req.req_header.dword_1 = cpu_to_be32(tm_function << 16); /* * The host shall provide the same value for LUN field in the basic * header and for Input Parameter. */ - treq.input_param1 = cpu_to_be32(lun_id); - treq.input_param2 = cpu_to_be32(task_id); + treq.upiu_req.input_param1 = cpu_to_be32(lun_id); + treq.upiu_req.input_param2 = cpu_to_be32(task_id); err = __ufshcd_issue_tm_cmd(hba, &treq, tm_function); if (err == -ETIMEDOUT) @@ -6513,7 +6517,7 @@ static int ufshcd_issue_tm_cmd(struct ufs_hba *hba, int lun_id, int task_id, dev_err(hba->dev, "%s: failed, ocs = 0x%x\n", __func__, ocs_value); else if (tm_response) - *tm_response = be32_to_cpu(treq.output_param1) & + *tm_response = be32_to_cpu(treq.upiu_rsp.output_param1) & MASK_TM_SERVICE_RESP; return err; } @@ -6693,7 +6697,7 @@ int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba, treq.header.dword_0 = cpu_to_le32(UTP_REQ_DESC_INT_CMD); treq.header.dword_2 = cpu_to_le32(OCS_INVALID_COMMAND_STATUS); - memcpy(&treq.req_header, req_upiu, sizeof(*req_upiu)); + memcpy(&treq.upiu_req, req_upiu, sizeof(*req_upiu)); err = __ufshcd_issue_tm_cmd(hba, &treq, tm_f); if (err == -ETIMEDOUT) @@ -6706,7 +6710,7 @@ int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba, break; } - memcpy(rsp_upiu, &treq.rsp_header, sizeof(*rsp_upiu)); + memcpy(rsp_upiu, &treq.upiu_rsp, sizeof(*rsp_upiu)); break; default: diff --git a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h index 6795e1f0e8f8..235236859285 100644 --- a/drivers/scsi/ufs/ufshci.h +++ b/drivers/scsi/ufs/ufshci.h @@ -482,17 +482,21 @@ struct utp_task_req_desc { struct request_desc_header header; /* DW 4-11 - Task request UPIU structure */ - struct utp_upiu_header req_header; - __be32 input_param1; - __be32 input_param2; - __be32 input_param3; - __be32 __reserved1[2]; + struct { + struct utp_upiu_header req_header; + __be32 input_param1; + __be32 input_param2; + __be32 input_param3; + __be32 __reserved1[2]; + } upiu_req; /* DW 12-19 - Task Management Response UPIU structure */ - struct utp_upiu_header rsp_header; - __be32 output_param1; - __be32 output_param2; - __be32 __reserved2[3]; + struct { + struct utp_upiu_header rsp_header; + __be32 output_param1; + __be32 output_param2; + __be32 __reserved2[3]; + } upiu_rsp; }; #endif /* End of Header */ -- 2.27.0
