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master 6943786: Avoid undefined behaviour when copying part of structure
From: |
Andreas Schwab |
Subject: |
master 6943786: Avoid undefined behaviour when copying part of structure |
Date: |
Mon, 29 Nov 2021 04:31:01 -0500 (EST) |
branch: master
commit 6943786b5c1fe76ea05a3a810512bd6777883710
Author: Andreas Schwab <schwab@linux-m68k.org>
Commit: Andreas Schwab <schwab@linux-m68k.org>
Avoid undefined behaviour when copying part of structure
* src/dispnew.c (copy_row_except_pointers): Don't use address of
subobject as starting point.
---
src/dispnew.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/dispnew.c b/src/dispnew.c
index f3f110a..a976bf9 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -1034,7 +1034,7 @@ copy_row_except_pointers (struct glyph_row *to, struct
glyph_row *from)
{
enum { off = offsetof (struct glyph_row, x) };
- memcpy (&to->x, &from->x, sizeof *to - off);
+ memcpy ((char *) to + off, (char *) from + off, sizeof *to - off);
}
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