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: ae98dbf ("io_uring/kbuf: add support for incremental buffer consumption")
Co-developed-by: Suoxing Zhang <[email protected]>
Signed-off-by: Suoxing Zhang <[email protected]>
Signed-off-by: Qingyue Zhang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: chunzhennn

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;