ubsan: emit_inc_line_addr integer overflow

amodra · amodra · commit 31fd9be3344a · 2025-05-16T20:46:42.000+09:30
Commit 07cf922 fixed the one in size_inc_line_addr. Silly me missed the identical overflow in emit_inc_line_addr
diff --git a/gas/dwarf2dbg.c b/gas/dwarf2dbg.c
@@ -1694,7 +1694,7 @@ emit_inc_line_addr (int line_delta, addressT addr_delta, char *p, int len)
     }
 
   /* Bias the line delta by the base.  */
-  tmp = line_delta - DWARF2_LINE_BASE;
+  tmp = (unsigned) line_delta - DWARF2_LINE_BASE;
 
   /* If the line increment is out of range of a special opcode, we
      must encode it with DW_LNS_advance_line.  */

Original file line number	Diff line number	Diff line change
`@@ -1694,7 +1694,7 @@ emit_inc_line_addr (int line_delta, addressT addr_delta, char *p, int len)`
`1694`	`1694`	`}`
`1695`	`1695`
`1696`	`1696`	`/* Bias the line delta by the base. */`
`1697`		`- tmp = line_delta - DWARF2_LINE_BASE;`
	`1697`	`+ tmp = (unsigned) line_delta - DWARF2_LINE_BASE;`
`1698`	`1698`
`1699`	`1699`	`/* If the line increment is out of range of a special opcode, we`
`1700`	`1700`	`must encode it with DW_LNS_advance_line. */`