diff options
| author | Tim Bird <tim.bird@am.sony.com> | 2012-02-07 18:34:28 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-08 16:52:45 -0800 |
| commit | 350a1955957d73352c043d0f948e3f28bb118c57 (patch) | |
| tree | e8dc845824980fac4e3398970ba605f9446a411c | |
| parent | 169c843afffcb328390ef39ff95227596d6f63c4 (diff) | |
staging: android: logger: clarify non-update of w_off in do_write_log_from_user
Add comment to explain when w_off is not updated in case of failed second
fragment copy to buffer.
Signed-off-by: Tim Bird <tim.bird@am.sony.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/android/logger.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c index 6d92b7ef0a55..0d2367f2c15f 100644 --- a/drivers/staging/android/logger.c +++ b/drivers/staging/android/logger.c @@ -330,6 +330,12 @@ static ssize_t do_write_log_from_user(struct logger_log *log, if (count != len) if (copy_from_user(log->buffer, buf + len, count - len)) + /* + * Note that by not updating w_off, this abandons the + * portion of the new entry that *was* successfully + * copied, just above. This is intentional to avoid + * message corruption from missing fragments. + */ return -EFAULT; log->w_off = logger_offset(log, log->w_off + count); |