* bug#19213: 25.0.50; [PATCH] * editfns.c (Ftranspose_regions): memmove instead of memcpy
@ 2014-11-28 20:26 Fredrik Bergroth
2016-02-23 11:41 ` Lars Ingebrigtsen
0 siblings, 1 reply; 2+ messages in thread
From: Fredrik Bergroth @ 2014-11-28 20:26 UTC (permalink / raw)
To: 19213
In one case, `memcpy' is used 4 times to transform [r1|mid|r2] into
[r2|mid|r1], but `dest' and `src' may overlap when copying the mid
interval, which is forbidden by `memcpy' and results in undefined
behavior. Instead use `memmove' like other cases do.
---
src/editfns.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/editfns.c b/src/editfns.c
index 0a07886..82bd26d 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -4898,7 +4898,7 @@ Transposing beyond buffer boundaries is an error. */)
start2_addr = BYTE_POS_ADDR (start2_byte);
memcpy (temp, start1_addr, len1_byte);
memcpy (start1_addr, start2_addr, len2_byte);
- memcpy (start1_addr + len2_byte, start1_addr + len1_byte, len_mid);
+ memmove (start1_addr + len2_byte, start1_addr + len1_byte, len_mid);
memcpy (start1_addr + len2_byte + len_mid, temp, len1_byte);
SAFE_FREE ();
--
1.9.1
^ permalink raw reply related [flat|nested] 2+ messages in thread* bug#19213: 25.0.50; [PATCH] * editfns.c (Ftranspose_regions): memmove instead of memcpy
2014-11-28 20:26 bug#19213: 25.0.50; [PATCH] * editfns.c (Ftranspose_regions): memmove instead of memcpy Fredrik Bergroth
@ 2016-02-23 11:41 ` Lars Ingebrigtsen
0 siblings, 0 replies; 2+ messages in thread
From: Lars Ingebrigtsen @ 2016-02-23 11:41 UTC (permalink / raw)
To: Fredrik Bergroth; +Cc: 19213
Fredrik Bergroth <fbergroth@gmail.com> writes:
> In one case, `memcpy' is used 4 times to transform [r1|mid|r2] into
> [r2|mid|r1], but `dest' and `src' may overlap when copying the mid
> interval, which is forbidden by `memcpy' and results in undefined
> behavior. Instead use `memmove' like other cases do.
> ---
> src/editfns.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/src/editfns.c b/src/editfns.c
> index 0a07886..82bd26d 100644
> --- a/src/editfns.c
> +++ b/src/editfns.c
> @@ -4898,7 +4898,7 @@ Transposing beyond buffer boundaries is an error. */)
> start2_addr = BYTE_POS_ADDR (start2_byte);
> memcpy (temp, start1_addr, len1_byte);
> memcpy (start1_addr, start2_addr, len2_byte);
> - memcpy (start1_addr + len2_byte, start1_addr + len1_byte, len_mid);
> + memmove (start1_addr + len2_byte, start1_addr + len1_byte, len_mid);
Thanks; applied to the Emacs trunk.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
^ permalink raw reply [flat|nested] 2+ messages in thread
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2014-11-28 20:26 bug#19213: 25.0.50; [PATCH] * editfns.c (Ftranspose_regions): memmove instead of memcpy Fredrik Bergroth
2016-02-23 11:41 ` Lars Ingebrigtsen
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