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authorQu Wenruo <>2018-03-30 15:35:26 +0800
committerDavid Sterba <>2018-03-30 22:15:55 +0200
commit64f3dc013676544d3f6142a80cfef99644e4e49a (patch)
tree786288d9607738369f100275a42710e79a0fce5c /image
parent3f42d56fcbc6420cf47bed601542a776b1bc7ca2 (diff)
btrfs-progs: disk-io: Fix read_extent_data() error handler for missing device
When device is missing, read_extent_data() (function exported from old btrfs check code) has the following problems: 1) Modifies @len parameter if device is missing If device returned in @multi is missing, @len can be larger than @max_len (originl length). This could confuse caller and underflow in the read loop. 2) Still returns 0 for missing device It only handles read error, missing device is not handled and 0 is returned. 3) Wrong check for device->fd In fact, 0 is also a valid fd. Although not possible under most cases, but still needs fix. Fix them all. Fixes: 1bad2f2f2dfe ("Btrfs-progs: fsck: add an option to check data csums") Signed-off-by: Qu Wenruo <> Signed-off-by: David Sterba <>
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