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| author | Vasily Averin <vvs@virtuozzo.com> | 2020-01-24 08:48:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-11 20:03:00 +0300 |
| commit | 8ea1411740a0b71b06a6eb8cf4aeeadbf540346b (patch) | |
| tree | 3d1252a7c2fc12cbffe7c8b30a442f26578dbfcf /drivers/s390/cio | |
| parent | 5f07ae5c8a2506af5ee979d588faa34514e314a7 (diff) | |
| download | linux-8ea1411740a0b71b06a6eb8cf4aeeadbf540346b.tar.xz | |
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>
Diffstat (limited to 'drivers/s390/cio')
| -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 2a3f874a21d5..9cebff8e8d74 100644 --- a/drivers/s390/cio/blacklist.c +++ b/drivers/s390/cio/blacklist.c @@ -303,8 +303,10 @@ 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) { @@ -314,7 +316,6 @@ cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset) return NULL; } else iter->devno++; - (*offset)++; return iter; } |