fix list traversal bug in update_dcb()

boeckmann · PerditionC · commit 42980dfe7d61 · 2024-08-05T20:44:15.000-04:00
This caused the kernel to hang when loading NETDRIVE.SYS
diff --git a/kernel/main.c b/kernel/main.c
@@ -567,7 +567,7 @@ STATIC VOID update_dcb(struct dhdr FAR * dhp)
   {
     struct dpb FAR *tmp_dpb;
     /* find current end of dpb chain by following next pointers to end */
-    for (tmp_dpb = LoL->DPBp; (ULONG) tmp_dpb->dpb_next != 0xffffffffl; tmp_dpb = dpb->dpb_next)
+    for (tmp_dpb = LoL->DPBp; (ULONG) tmp_dpb->dpb_next != 0xffffffffl; tmp_dpb = tmp_dpb->dpb_next)
       ;
     /* insert into chain [at end] */
     tmp_dpb->dpb_next = dpb;

Original file line number	Diff line number	Diff line change
`@@ -567,7 +567,7 @@ STATIC VOID update_dcb(struct dhdr FAR * dhp)`
`567`	`567`	`{`
`568`	`568`	`struct dpb FAR *tmp_dpb;`
`569`	`569`	`/* find current end of dpb chain by following next pointers to end */`
`570`		`- for (tmp_dpb = LoL->DPBp; (ULONG) tmp_dpb->dpb_next != 0xffffffffl; tmp_dpb = dpb->dpb_next)`
	`570`	`+ for (tmp_dpb = LoL->DPBp; (ULONG) tmp_dpb->dpb_next != 0xffffffffl; tmp_dpb = tmp_dpb->dpb_next)`
`571`	`571`	`;`
`572`	`572`	`/* insert into chain [at end] */`
`573`	`573`	`tmp_dpb->dpb_next = dpb;`