Messages in this thread Patch in this message | | | From | Vasily Averin <> | Subject | [PATCH 7/7] sysvipc_find_ipc should increase position index | Date | Fri, 24 Jan 2020 10:03:12 +0300 |
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if seq_file .next fuction does not change position index, read after some lseek can generate unexpected output.
https://bugzilla.kernel.org/show_bug.cgi?id=206283 Signed-off-by: Vasily Averin <vvs@virtuozzo.com> --- ipc/util.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/ipc/util.c b/ipc/util.c index 915eacb..7a3ab2e 100644 --- a/ipc/util.c +++ b/ipc/util.c @@ -764,13 +764,13 @@ static struct kern_ipc_perm *sysvipc_find_ipc(struct ipc_ids *ids, loff_t pos, total++; } + *new_pos = pos + 1; if (total >= ids->in_use) return NULL; for (; pos < ipc_mni; pos++) { ipc = idr_find(&ids->ipcs_idr, pos); if (ipc != NULL) { - *new_pos = pos + 1; rcu_read_lock(); ipc_lock_object(ipc); return ipc; -- 1.8.3.1
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