path: root/btrfs-fragments.c
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authorIvan Jager <>2014-01-17 15:00:43 +0100
committerChris Mason <>2014-01-31 08:22:29 -0800
commit0511ca4b502f1cbdd5e92c287d97c8356cdaff66 (patch)
tree0896447a6c31d9bd0a796c5501f59a9781cddc57 /btrfs-fragments.c
parentef3f6124f0b5e8be126999f27f7f299a6bb3fbf6 (diff)
btrfs-progs: Fix bus error on sparc
Currently, as of 8cae1840afb3ea44dcc298f32983e577480dfee4 when running btrfs-convert I get a bus error. The problem is that struct btrfs_key has __attribute__ ((__packed__)) so it is not aligned. Then, a pointer to it's objectid field is taken, cast to a void*, then eventually cast back to a u64* and dereferenced. The problem is that the dereferenced u64* is not necessarily aligned (ie, not necessarily a valid u64*), resulting in undefined behavior. This patch adds a local u64 variable which would of course be properly aligned and then uses a pointer to that. I did not modify the call from btrfs_fs_roots_compare_roots as that uses struct btrfs_root which is a regular struct and would thus have it's members correctly aligned to begin with. After patching this I realized Liu Bo had already written a similar patch, but I think mine is cleaner, so I'm sending it anyway. Signed-off-by: Ivan Jager <> Signed-off-by: David Sterba <> Signed-off-by: Chris Mason <>
Diffstat (limited to 'btrfs-fragments.c')
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