add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/scsi/ses.c
..
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@@ -433,8 +433,8 @@
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 }
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 #endif  /*  0  */
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-static void ses_process_descriptor(struct enclosure_component *ecomp,
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-				   unsigned char *desc)
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+static int ses_process_descriptor(struct enclosure_component *ecomp,
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+				   unsigned char *desc, int max_desc_len)
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 {
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 	int eip = desc[0] & 0x10;
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 	int invalid = desc[0] & 0x80;
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@@ -445,22 +445,32 @@
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 	unsigned char *d;
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 	if (invalid)
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-		return;
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+		return 0;
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 	switch (proto) {
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 	case SCSI_PROTOCOL_FCP:
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 		if (eip) {
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+			if (max_desc_len <= 7)
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+				return 1;
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 			d = desc + 4;
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 			slot = d[3];
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 		}
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 		break;
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 	case SCSI_PROTOCOL_SAS:
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+
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 		if (eip) {
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+			if (max_desc_len <= 27)
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+				return 1;
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 			d = desc + 4;
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 			slot = d[3];
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 			d = desc + 8;
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-		} else
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+		} else {
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+			if (max_desc_len <= 23)
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+				return 1;
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 			d = desc + 4;
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+		}
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+
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+
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 		/* only take the phy0 addr */
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 		addr = (u64)d[12] << 56 |
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 			(u64)d[13] << 48 |
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@@ -477,6 +487,8 @@
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 	}
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 	ecomp->slot = slot;
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 	scomp->addr = addr;
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+
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+	return 0;
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 }
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 struct efd {
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@@ -490,9 +502,6 @@
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 	struct efd *efd = data;
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 	int i;
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 	struct ses_component *scomp;
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-
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-	if (!edev->component[0].scratch)
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-		return 0;
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505
 
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 	for (i = 0; i < edev->components; i++) {
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 		scomp = edev->component[i].scratch;
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@@ -549,7 +558,7 @@
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 		/* skip past overall descriptor */
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 		desc_ptr += len + 4;
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 	}
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-	if (ses_dev->page10)
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+	if (ses_dev->page10 && ses_dev->page10_len > 9)
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 		addl_desc_ptr = ses_dev->page10 + 8;
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 	type_ptr = ses_dev->page1_types;
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 	components = 0;
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@@ -557,17 +566,22 @@
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 		for (j = 0; j < type_ptr[1]; j++) {
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 			char *name = NULL;
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 			struct enclosure_component *ecomp;
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+			int max_desc_len;
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 			if (desc_ptr) {
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-				if (desc_ptr >= buf + page7_len) {
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+				if (desc_ptr + 3 >= buf + page7_len) {
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 					desc_ptr = NULL;
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 				} else {
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 					len = (desc_ptr[2] << 8) + desc_ptr[3];
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 					desc_ptr += 4;
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-					/* Add trailing zero - pushes into
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-					 * reserved space */
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-					desc_ptr[len] = '\0';
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-					name = desc_ptr;
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+					if (desc_ptr + len > buf + page7_len)
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+						desc_ptr = NULL;
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+					else {
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+						/* Add trailing zero - pushes into
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+						 * reserved space */
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+						desc_ptr[len] = '\0';
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+						name = desc_ptr;
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+					}
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 				}
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 			}
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 			if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
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@@ -579,14 +593,20 @@
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 						components++,
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 						type_ptr[0],
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 						name);
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-				else
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+				else if (components < edev->components)
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 					ecomp = &edev->component[components++];
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+				else
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+					ecomp = ERR_PTR(-EINVAL);
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 				if (!IS_ERR(ecomp)) {
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-					if (addl_desc_ptr)
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-						ses_process_descriptor(
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-							ecomp,
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-							addl_desc_ptr);
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+					if (addl_desc_ptr) {
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+						max_desc_len = ses_dev->page10_len -
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+						    (addl_desc_ptr - ses_dev->page10);
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+						if (ses_process_descriptor(ecomp,
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+						    addl_desc_ptr,
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+						    max_desc_len))
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+							addl_desc_ptr = NULL;
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+					}
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 					if (create)
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 						enclosure_component_register(
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 							ecomp);
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@@ -603,9 +623,11 @@
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 			     /* these elements are optional */
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 			     type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_TARGET_PORT ||
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 			     type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_INITIATOR_PORT ||
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-			     type_ptr[0] == ENCLOSURE_COMPONENT_CONTROLLER_ELECTRONICS))
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+			     type_ptr[0] == ENCLOSURE_COMPONENT_CONTROLLER_ELECTRONICS)) {
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 				addl_desc_ptr += addl_desc_ptr[1] + 2;
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-
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+				if (addl_desc_ptr + 1 >= ses_dev->page10 + ses_dev->page10_len)
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+					addl_desc_ptr = NULL;
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+			}
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 		}
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 	}
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 	kfree(buf);
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@@ -704,6 +726,7 @@
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 		    type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
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 			components += type_ptr[1];
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 	}
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+
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 	ses_dev->page1 = buf;
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 	ses_dev->page1_len = len;
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 	buf = NULL;
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@@ -745,9 +768,11 @@
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 		buf = NULL;
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 	}
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 page2_not_supported:
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-	scomp = kcalloc(components, sizeof(struct ses_component), GFP_KERNEL);
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-	if (!scomp)
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-		goto err_free;
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+	if (components > 0) {
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+		scomp = kcalloc(components, sizeof(struct ses_component), GFP_KERNEL);
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+		if (!scomp)
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+			goto err_free;
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+	}
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 	edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
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 				  components, &ses_enclosure_callbacks);
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@@ -827,7 +852,8 @@
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 	kfree(ses_dev->page2);
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 	kfree(ses_dev);
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-	kfree(edev->component[0].scratch);
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+	if (edev->components)
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+		kfree(edev->component[0].scratch);
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 	put_device(&edev->edev);
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 	enclosure_unregister(edev);