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| author |   Vasily Averin <vvs@virtuozzo.com> | 2020-01-23 12:05:10 +0300 |
|---|---|---|
| committer |   Theodore Ts'o <tytso@mit.edu> | 2020-01-25 02:30:46 -0500 |
| commit | 1a8e9cf40c9a6a2e40b1e924b13ed303aeea4418 (patch) | |
| tree | d62a68e60c0387ac45c79584ca8ec256e764123c /fs/jbd2 | |
| parent | jbd2: remove pointless assertion in __journal_remove_journal_head (diff) | |
| download | linux-dev-1a8e9cf40c9a6a2e40b1e924b13ed303aeea4418.tar.xz linux-dev-1a8e9cf40c9a6a2e40b1e924b13ed303aeea4418.zip | |
jbd2_seq_info_next should increase position index
if seq_file .next fuction does not change position index,
read after some lseek can generate unexpected output.
Script below generates endless output
$ q=;while read -r r;do echo "$((++q)) $r";done </proc/fs/jbd2/DEV/info
https://bugzilla.kernel.org/show_bug.cgi?id=206283
Fixes: 1f4aace60b0e ("fs/seq_file.c: simplify seq_file iteration code and interface")
Cc: stable@kernel.org
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/d13805e5-695e-8ac3-b678-26ca2313629f@virtuozzo.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2')
| -rw-r--r-- | fs/jbd2/journal.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index 1c61491fd86f..5f9edb12f11a 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -982,6 +982,7 @@ static void *jbd2_seq_info_start(struct seq_file *seq, loff_t *pos) static void *jbd2_seq_info_next(struct seq_file *seq, void *v, loff_t *pos) { + (*pos)++; return NULL; } |