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R. Silva" Cc: Chris Mason , David Sterba , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org References: <20251003143502.GJ4052@suse.cz> Content-Language: en-US From: "Gustavo A. R. Silva" In-Reply-To: <20251003143502.GJ4052@suse.cz> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator4166.hostgator.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 185.134.146.81 X-Source-L: No X-Exim-ID: 1v4h8J-00000001gmy-0fZk X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: ([10.21.53.44]) [185.134.146.81]:45090 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 2 X-Org: HG=hgshared;ORG=hostgator; X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes X-CMAE-Envelope: MS4xfH1aqKbbLJwXJOOWvVZlvSaNe8BWlxtVXu2AmpoIeg5Cbx+/WoXJe00wcSXYq1J8Aq4OQZAVNHQpDjp7MhDxSOuGvJcemO3dgPlmAYPxJiZH8A2iomhk viVsZS2aYrz+M2Zswxr2RP1x7p9A4Azb95PKo1iPNRVP20IF4x1Pv+oZ8zkEM2sgiQ8GejrzUr9HkEfMAqmO9gs8yY3MN273tp69ewFQdhrPvXPDuiMsPrI2 On 10/3/25 15:35, David Sterba wrote: > On Fri, Oct 03, 2025 at 03:11:06PM +0100, Gustavo A. R. Silva wrote: >> -Wflex-array-member-not-at-end was introduced in GCC-14, and we are >> getting ready to enable it, globally. >> >> Move the conflicting declaration to the end of the corresponding >> structure. Notice that `struct fs_path` is a flexible structure, >> this is a structure that contains a flexible-array member (`char >> inline_buf[];` in this case). > > It contains a flexible member but also a padding array and a limit > calculated for the usable space of inline_buf (FS_PATH_INLINE_SIZE), > it's not the pattern where flexible array is in the middle of a > structure and could potentially overwrite other members. Yep, I notice that while reviewing the context in which this is being used. :) > >> Fix the following warning: >> >> fs/btrfs/send.c:181:24: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] > > Otheriwse OK to fix the warning. Thanks. > >> Signed-off-by: Gustavo A. R. Silva >> --- >> fs/btrfs/send.c | 4 +++- >> 1 file changed, 3 insertions(+), 1 deletion(-) >> >> diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c >> index 9230e5066fc6..2b7cf49a35bb 100644 >> --- a/fs/btrfs/send.c >> +++ b/fs/btrfs/send.c >> @@ -178,7 +178,6 @@ struct send_ctx { >> u64 cur_inode_rdev; >> u64 cur_inode_last_extent; >> u64 cur_inode_next_write_offset; >> - struct fs_path cur_inode_path; >> bool cur_inode_new; >> bool cur_inode_new_gen; >> bool cur_inode_deleted; >> @@ -305,6 +304,9 @@ struct send_ctx { >> >> struct btrfs_lru_cache dir_created_cache; >> struct btrfs_lru_cache dir_utimes_cache; >> + >> + /* Must be last --ends in a flexible-array member. */ > ^^ > > Is this an en dash? Not sure what you mean. -Gustavo > >> + struct fs_path cur_inode_path; >> }; >> >> struct pending_dir_move { >> -- >> 2.43.0 >>