lkml.org 
[lkml]   [2018]   [Aug]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] bnxt_en: avoid string overflow for record->system_name
On Mon, Aug 13, 2018 at 2:26 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> The utsname()->nodename string may be 64 bytes long, and it gets
> copied without the trailing nul byte into the shorter record->system_name,
> as gcc now warns:
>
> In file included from include/linux/bitmap.h:9,
> from include/linux/ethtool.h:16,
> from drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c:13:
> In function 'strncpy',
> inlined from 'bnxt_fill_coredump_record' at drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c:2863:2:
> include/linux/string.h:254:9: error: '__builtin_strncpy' output truncated before terminating nul copying as many bytes from a string as its length [-Werror=stringop-truncation]
>
> Using strlcpy() at least avoids overflowing the destination buffer
> and adds proper nul-termination. It may still truncate long names
> though, which probably can't be solved here.
>
> Fixes: 6c5657d085ae ("bnxt_en: Add support for ethtool get dump.")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Thanks.

Acked-by: Michael Chan <michael.chan@broadcom.com>

\
 
 \ /
  Last update: 2018-08-13 23:48    [W:0.057 / U:0.052 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site