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Message-ID: <20220823153542.177799-1-code@siddh.me> Date: Tue, 23 Aug 2022 21:05:42 +0530 From: Siddh Raman Pant <code@...dh.me> To: willy@...radead.org Cc: code@...dh.me, david@...morbit.com, djwong@...nel.org, fgheet255t@...il.com, hch@...radead.org, linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org, riteshh@...ux.ibm.com, syzbot+a8e049cd3abd342936b6@...kaller.appspotmail.com, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] WARNING in iomap_iter Oof, I didn't mean it to be there. That would actually be wrong anyways. Extremely sorry for the avoidable oversight, Siddh #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master --- drivers/block/loop.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index e3c0ba93c1a3..e1fe8eda020f 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -979,6 +979,11 @@ loop_set_status_from_info(struct loop_device *lo, lo->lo_offset = info->lo_offset; lo->lo_sizelimit = info->lo_sizelimit; + + /* loff_t vars have been assigned __u64 */ + if (lo->lo_offset < 0 || lo->lo_sizelimit < 0) + return -EOVERFLOW; + memcpy(lo->lo_file_name, info->lo_file_name, LO_NAME_SIZE); lo->lo_file_name[LO_NAME_SIZE-1] = 0; lo->lo_flags = info->lo_flags; -- 2.35.1
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