git: d8fe1e4c5a9d - stable/14 - ocs: Check for copyin errors in the ioctl handler

The branch stable/14 has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=d8fe1e4c5a9dd17d79635c5964b7fa68f1954bea

commit d8fe1e4c5a9dd17d79635c5964b7fa68f1954bea
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2023-12-26 01:38:57 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2024-01-02 00:29:46 +0000

    ocs: Check for copyin errors in the ioctl handler
    
    If copyin() fails, the driver will blindly proceed with whatever had
    been in the uninitialized DMA buffer.  This is not what we want.  Check
    for copyin failures.
    
    This is in preparation for annotating copyin() and related functions
    with __result_use_check.
    
    Reviewed by:    ram
    MFC after:      1 week
    Differential Revision:  https://reviews.freebsd.org/D43097
    
    (cherry picked from commit a01ff11cb73d7a1988f6241f63d141371ff23717)
---
 sys/dev/ocs_fc/ocs_ioctl.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/sys/dev/ocs_fc/ocs_ioctl.c b/sys/dev/ocs_fc/ocs_ioctl.c
index 6021ddf5c0d6..71ba17d5f72a 100644
--- a/sys/dev/ocs_fc/ocs_ioctl.c
+++ b/sys/dev/ocs_fc/ocs_ioctl.c
@@ -86,6 +86,7 @@ static int
 ocs_process_sli_config (ocs_t *ocs, ocs_ioctl_elxu_mbox_t *mcmd, ocs_dma_t *dma)
 {
 	sli4_cmd_sli_config_t *sli_config = (sli4_cmd_sli_config_t *)mcmd->payload;
+	int error;
 
 	if (sli_config->emb) {
 		sli4_req_hdr_t	*req = (sli4_req_hdr_t *)sli_config->payload.embed;
@@ -127,7 +128,13 @@ ocs_process_sli_config (ocs_t *ocs, ocs_ioctl_elxu_mbox_t *mcmd, ocs_dma_t *dma)
 			wrobj->host_buffer_descriptor[0].u.data.buffer_address_high = ocs_addr32_hi(dma->phys);
 
 			/* copy the data into the DMA buffer */
-			copyin((void *)(uintptr_t)mcmd->in_addr, dma->virt, mcmd->in_bytes);
+			error = copyin((void *)(uintptr_t)mcmd->in_addr, dma->virt, mcmd->in_bytes);
+			if (error != 0) {
+				device_printf(ocs->dev, "%s: COMMON_WRITE_OBJECT - copyin failed: %d\n",
+						__func__, error);
+				ocs_dma_free(ocs, dma);
+				return error;
+			}
 		}
 			break;
 		case SLI4_OPC_COMMON_DELETE_OBJECT:
@@ -170,7 +177,13 @@ ocs_process_sli_config (ocs_t *ocs, ocs_ioctl_elxu_mbox_t *mcmd, ocs_dma_t *dma)
 			return ENXIO;
 		}
 
-		copyin((void *)(uintptr_t)mcmd->in_addr, dma->virt, mcmd->in_bytes);
+		error = copyin((void *)(uintptr_t)mcmd->in_addr, dma->virt, mcmd->in_bytes);
+		if (error != 0) {
+			device_printf(ocs->dev, "%s: non-embedded - copyin failed: %d\n",
+					__func__, error);
+			ocs_dma_free(ocs, dma);
+			return error;
+		}
 
 		sli_config->payload.mem.address_low  = ocs_addr32_lo(dma->phys);
 		sli_config->payload.mem.address_high = ocs_addr32_hi(dma->phys);
@@ -184,6 +197,9 @@ static int
 ocs_process_mbx_ioctl(ocs_t *ocs, ocs_ioctl_elxu_mbox_t *mcmd)
 {
 	ocs_dma_t	dma = { 0 };
+	int error;
+
+	error = 0;
 
 	if ((ELXU_BSD_MAGIC != mcmd->magic) ||
 			(sizeof(ocs_ioctl_elxu_mbox_t) != mcmd->size)) {
@@ -238,13 +254,13 @@ ocs_process_mbx_ioctl(ocs_t *ocs, ocs_ioctl_elxu_mbox_t *mcmd)
 
 	if( SLI4_MBOX_COMMAND_SLI_CONFIG == ((sli4_mbox_command_header_t *)mcmd->payload)->command
 	  		&& mcmd->out_bytes && dma.virt) {
-		copyout(dma.virt, (void *)(uintptr_t)mcmd->out_addr, mcmd->out_bytes);
+		error = copyout(dma.virt, (void *)(uintptr_t)mcmd->out_addr, mcmd->out_bytes);
 	}
 
 no_support:
 	ocs_dma_free(ocs, &dma);
 
-	return 0;
+	return error;
 }
 
 /**