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| author | Vasily Averin <vvs@virtuozzo.com> | 2020-01-23 12:05:10 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-11 04:34:06 -0800 |
| commit | 68e81e14ddb897d5392cb4967ac398b52435adea (patch) | |
| tree | ef6414443260490c00edf538800bd7890593029c /fs | |
| parent | 729c1232c7f1c6427851d835d0d36c2d75f097bf (diff) | |
| download | linux-stable-68e81e14ddb897d5392cb4967ac398b52435adea.tar.gz linux-stable-68e81e14ddb897d5392cb4967ac398b52435adea.tar.bz2 linux-stable-68e81e14ddb897d5392cb4967ac398b52435adea.zip | |
jbd2_seq_info_next should increase position index
commit 1a8e9cf40c9a6a2e40b1e924b13ed303aeea4418 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -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 df390a69c49a..1a2339f2cb49 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -1002,6 +1002,7 @@ 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; } |