From c64eff368ac676e8540344d27a3de47e0ad90d21 Mon Sep 17 00:00:00 2001 From: Qingyue Zhang Date: Wed, 27 Aug 2025 19:43:39 +0800 Subject: [PATCH] io_uring/kbuf: fix signedness in this_len calculation When importing and using buffers, buf->len is considered unsigned. However, buf->len is converted to signed int when committing. This can lead to unexpected behavior if the buffer is large enough to be interpreted as a negative value. Make min_t calculation unsigned. Fixes: ae98dbf43d75 ("io_uring/kbuf: add support for incremental buffer consumption") Co-developed-by: Suoxing Zhang Signed-off-by: Suoxing Zhang Signed-off-by: Qingyue Zhang Link: https://lore.kernel.org/r/tencent_4DBB3674C0419BEC2C0C525949DA410CA307@qq.com Signed-off-by: Jens Axboe --- io_uring/kbuf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c index f2d2cc319faac..81a13338dfab3 100644 --- a/io_uring/kbuf.c +++ b/io_uring/kbuf.c @@ -39,7 +39,7 @@ static bool io_kbuf_inc_commit(struct io_buffer_list *bl, int len) u32 this_len; buf = io_ring_head_to_buf(bl->buf_ring, bl->head, bl->mask); - this_len = min_t(int, len, buf->len); + this_len = min_t(u32, len, buf->len); buf->len -= this_len; if (buf->len) { buf->addr += this_len; -- 2.39.5