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virtio_blk: set log2blksz correctly

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'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 <takahiro.akashi@linaro.org>
Fixes: f4802209e5 ("virtio: Add block driver support")
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
AKASHI Takahiro 2020-08-19 18:07:32 +09:00 committed by Tom Rini
parent 91f6c1ca2e
commit 6b0ddd1fbc
1 changed files with 1 additions and 0 deletions
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drivers/virtio/virtio_blk.c
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@ -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;