From 6b0ddd1fbc6c8f7cbd0418e8a87d02404ad3dd9b Mon Sep 17 00:00:00 2001 From: AKASHI Takahiro Date: Wed, 19 Aug 2020 18:07:32 +0900 Subject: [PATCH] virtio_blk: set log2blksz correctly 'log2blksz' in blk_desc structure must always be initialized, otherwise it will cause a lot of weird failures in file operations. For example, fs_set_blk_dev[_with_part]() examines a block device against every file system with its probe function. In particular, ext4 file system's ext4_probe() will calls fs_devread() to fetch a super block. If log2blksz is 0, the actual 'read' size, i.e. block_len >> log2blksz, is much bigger than a buffer's size, and it can end up with memory corruption. Signed-off-by: AKASHI Takahiro Fixes: f4802209e59d ("virtio: Add block driver support") Reviewed-by: Bin Meng --- drivers/virtio/virtio_blk.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/virtio/virtio_blk.c b/drivers/virtio/virtio_blk.c index 992118c607..1799f5c5eb 100644 --- a/drivers/virtio/virtio_blk.c +++ b/drivers/virtio/virtio_blk.c @@ -115,6 +115,7 @@ static int virtio_blk_probe(struct udevice *dev) return ret; desc->blksz = 512; + desc->log2blksz = 9; virtio_cread(dev, struct virtio_blk_config, capacity, &cap); desc->lba = cap; -- 2.39.5