diff options
| author | Vasily Averin <vvs@virtuozzo.com> | 2020-01-24 08:48:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-11 07:53:10 +0100 |
| commit | cfbd8af0ad0cd3f7159fadd8e4302bcd449feee7 (patch) | |
| tree | dbd0ab2d8fbc70a70d467be560aac513e9677aea | |
| parent | d430867c2df0250bfa4ff260ae9687982c7b1f93 (diff) | |
s390/cio: cio_ignore_proc_seq_next should increase position index
[ Upstream commit 8b101a5e14f2161869636ff9cb4907b7749dc0c2 ]
if seq_file .next fuction does not change position index,
read after some lseek can generate unexpected output.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=206283
Link: https://lore.kernel.org/r/d44c53a7-9bc1-15c7-6d4a-0c10cb9dffce@virtuozzo.com
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/s390/cio/blacklist.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/s390/cio/blacklist.c b/drivers/s390/cio/blacklist.c index 9082476b51db..4e9f794176d3 100644 --- a/drivers/s390/cio/blacklist.c +++ b/drivers/s390/cio/blacklist.c @@ -302,8 +302,10 @@ static void * cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset) { struct ccwdev_iter *iter; + loff_t p = *offset; - if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1)) + (*offset)++; + if (p >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1)) return NULL; iter = it; if (iter->devno == __MAX_SUBCHANNEL) { @@ -313,7 +315,6 @@ cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset) return NULL; } else iter->devno++; - (*offset)++; return iter; } |