Re: [syzbot] [net?] general protection fault in put_page (3)

[Hillf Danton]

On Fri, 01 Nov 2024 10:44:24 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    f9f24ca362a4 Add linux-next specific files for 20241031
> git tree:       linux-next
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=153e5540580000

#syz test

--- x/lib/iov_iter.c
+++ y/lib/iov_iter.c
@@ -1727,6 +1727,10 @@ static ssize_t iov_iter_extract_bvec_pag
 
 		(*pages)[k++] = bv.bv_page;
 		size += bv.bv_len;
+		if (size > maxsize) {
+			size = maxsize;
+			break;
+		}
 
 		if (k >= maxpages)
 			break;
--