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author | Eryu Guan <guaneryu@gmail.com> | 2013-02-22 15:27:47 -0500 |
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committer | Theodore Ts'o <tytso@mit.edu> | 2013-02-22 15:27:47 -0500 |
commit | d43814721111041e26671a153e300e2054fb36fa (patch) | |
tree | cf9fd202aca4cae83989000219921ac99134f557 /virt/kvm | |
parent | 1231b3a1eb5740192aeebf5344dd6d6da000febf (diff) |
ext4: no need to remove extent if len is 0 in ext4_es_remove_extent()
len is 0 means no extent needs to be removed, so return immediately.
Otherwise it could trigger the following BUG_ON() in
ext4_es_remove_extent()
end = lblk + len - 1;
BUG_ON(end < lblk);
This could be reproduced by a simple truncate(1) command by an
unprivileged user
truncate -s $(($((2**32 - 1)) * 4096)) /mnt/ext4/testfile
The same is true for __es_insert_extent().
Patched kernel passed xfstests regression test.
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Diffstat (limited to 'virt/kvm')
0 files changed, 0 insertions, 0 deletions