* [PATCH] Add missing position handling to mount parameters gid/backup_gid/snapshot
@ 2020-11-26 0:28 Simon Arlott
2020-12-09 19:33 ` Pavel Shilovsky
0 siblings, 1 reply; 2+ messages in thread
From: Simon Arlott @ 2020-11-26 0:28 UTC (permalink / raw)
To: linux-cifs
The code tries to optimise for the last parameter not needing to update
the position which means that every time a new one is added to the end
by copying and pasting, the string position is not updated.
That makes it impossible to use backup_uid=/backup_gid=/snapshot= after
gid= or snapshot= after backup_gid= because part of the string is
overwritten and contains invalid keys like "gbackup_uid".
Prepare for the next parameter to be added on the end by updating the
position for snapshot= even though it will be unused.
---
mount.cifs.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mount.cifs.c b/mount.cifs.c
index 4feb397..a169bc6 100644
--- a/mount.cifs.c
+++ b/mount.cifs.c
@@ -1229,6 +1229,7 @@ nocopy:
out_len++;
}
snprintf(out + out_len, word_len + 5, "gid=%s", txtbuf);
+ out_len = strlen(out);
}
if (got_bkupuid) {
word_len = snprintf(txtbuf, sizeof(txtbuf), "%u", bkupuid);
@@ -1260,6 +1261,7 @@ nocopy:
out_len++;
}
snprintf(out + out_len, word_len + 11, "backupgid=%s", txtbuf);
+ out_len = strlen(out);
}
if (got_snapshot) {
word_len = snprintf(txtbuf, sizeof(txtbuf), "%llu", snapshot);
@@ -1275,6 +1277,7 @@ nocopy:
out_len++;
}
snprintf(out + out_len, word_len + 11, "snapshot=%s", txtbuf);
+ out_len = strlen(out);
}
return 0;
--
2.17.1
--
Simon Arlott
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] Add missing position handling to mount parameters gid/backup_gid/snapshot
2020-11-26 0:28 [PATCH] Add missing position handling to mount parameters gid/backup_gid/snapshot Simon Arlott
@ 2020-12-09 19:33 ` Pavel Shilovsky
0 siblings, 0 replies; 2+ messages in thread
From: Pavel Shilovsky @ 2020-12-09 19:33 UTC (permalink / raw)
To: Simon Arlott; +Cc: linux-cifs
Merged. Thanks!
--
Best regards,
Pavel Shilovsky
ср, 25 нояб. 2020 г. в 16:38, Simon Arlott <simon@octiron.net>:
>
> The code tries to optimise for the last parameter not needing to update
> the position which means that every time a new one is added to the end
> by copying and pasting, the string position is not updated.
>
> That makes it impossible to use backup_uid=/backup_gid=/snapshot= after
> gid= or snapshot= after backup_gid= because part of the string is
> overwritten and contains invalid keys like "gbackup_uid".
>
> Prepare for the next parameter to be added on the end by updating the
> position for snapshot= even though it will be unused.
> ---
> mount.cifs.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/mount.cifs.c b/mount.cifs.c
> index 4feb397..a169bc6 100644
> --- a/mount.cifs.c
> +++ b/mount.cifs.c
> @@ -1229,6 +1229,7 @@ nocopy:
> out_len++;
> }
> snprintf(out + out_len, word_len + 5, "gid=%s", txtbuf);
> + out_len = strlen(out);
> }
> if (got_bkupuid) {
> word_len = snprintf(txtbuf, sizeof(txtbuf), "%u", bkupuid);
> @@ -1260,6 +1261,7 @@ nocopy:
> out_len++;
> }
> snprintf(out + out_len, word_len + 11, "backupgid=%s", txtbuf);
> + out_len = strlen(out);
> }
> if (got_snapshot) {
> word_len = snprintf(txtbuf, sizeof(txtbuf), "%llu", snapshot);
> @@ -1275,6 +1277,7 @@ nocopy:
> out_len++;
> }
> snprintf(out + out_len, word_len + 11, "snapshot=%s", txtbuf);
> + out_len = strlen(out);
> }
>
> return 0;
> --
> 2.17.1
>
> --
> Simon Arlott
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2020-12-09 19:35 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-11-26 0:28 [PATCH] Add missing position handling to mount parameters gid/backup_gid/snapshot Simon Arlott
2020-12-09 19:33 ` Pavel Shilovsky
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).