[PATCH] io_uring/fdinfo: fix SQE_MIXED SQE displaying

[PATCH] io_uring/fdinfo: fix SQE_MIXED SQE displaying

[Jens Axboe]

When displaying pending SQEs for a MIXED ring, each 128-byte SQE
increments sq_head to skip the second slot, but the loop counter is not
adjusted. This can cause the loop to read past sq_tail by one entry for
each 128-byte SQE encountered, displaying SQEs that haven't been made
consumable yet by the application.

Match the kernel's own consumption logic in io_init_req() which
decrements what's left when consuming the extra slot.

Fixes: 1cba30bf9fdd ("io_uring: add support for IORING_SETUP_SQE_MIXED")
Signed-off-by: Jens Axboe <axboe@kernel.dk>

---

diff --git a/io_uring/fdinfo.c b/io_uring/fdinfo.c
index 80178b69e05a..25c92ace18bd 100644
--- a/io_uring/fdinfo.c
+++ b/io_uring/fdinfo.c
@@ -125,6 +125,7 @@ static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m)
 					sq_idx);
 				break;
 			}
+			i++;
 			sqe128 = true;
 		}
 		seq_printf(m, "%5u: opcode:%s, fd:%d, flags:%x, off:%llu, "

-- 
Jens Axboe