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jbd2_seq_info_next should increase position index

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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: 1f4aace60b ("fs/seq_file.c: simplify seq_file iteration code and interface")
Cc: [email protected]
Signed-off-by: Vasily Averin <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Theodore Ts'o <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Vasily Averin 2020-01-23 12:05:10 +03:00 • committed by Greg Kroah-Hartman
commit b19f130269
1 changed files with 1 additions and 0 deletions
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1
fs/jbd2/journal.c
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@ -981,6 +981,7 @@ 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;
}