kernel/vfs: Sanity checks before performing reads/writes

fox32-arch · Sep 14, 2023 · d41fcd8 · d41fcd8
1 parent 9ae1e47
commit d41fcd8
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/kernel/vfs/vfs.asm b/kernel/vfs/vfs.asm
@@ -151,6 +151,12 @@ stream_get_size:
 ; outputs:
 ; none
 read:
+    cmp r0, 0
+    ifz ret
+    cmp r1, 0
+    ifz ret
+    cmp r2, 0
+    ifz ret
     push r3
     push r1
     add r1, 7
@@ -212,6 +218,10 @@ stream_read_char:
 ; outputs:
 ; none
 write:
+    cmp r0, 0
+    ifz ret
+    cmp r1, 0
+    ifz ret
     push r3
     push r1
     add r1, 7