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Revert "ipc: replace costly bailout check in sysvipc_find_ipc()"

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This reverts commit 5d6d68e94e.
This commit is contained in:
Ksawlii 2024-11-24 00:23:50 +01:00
parent 42755cc6a5
commit 15c909dc17
1 changed files with 12 additions and 4 deletions
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16
ipc/util.c
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@ -754,13 +754,21 @@ struct pid_namespace *ipc_seq_pid_ns(struct seq_file *s)
static struct kern_ipc_perm *sysvipc_find_ipc(struct ipc_ids *ids, loff_t pos, static struct kern_ipc_perm *sysvipc_find_ipc(struct ipc_ids *ids, loff_t pos,
loff_t *new_pos) loff_t *new_pos)
{ {
struct kern_ipc_perm *ipc = NULL; struct kern_ipc_perm *ipc;
int max_idx = ipc_get_maxidx(ids); int total, id;
if (max_idx == -1 || pos > max_idx) total = 0;
for (id = 0; id < pos && total < ids->in_use; id++) {
ipc = idr_find(&ids->ipcs_idr, id);
if (ipc != NULL)
total++;
}
ipc = NULL;
if (total >= ids->in_use)
goto out; goto out;
for (; pos <= max_idx; pos++) { for (; pos < ipc_mni; pos++) {
ipc = idr_find(&ids->ipcs_idr, pos); ipc = idr_find(&ids->ipcs_idr, pos);
if (ipc != NULL) { if (ipc != NULL) {
rcu_read_lock(); rcu_read_lock();