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f2fs: check position in move range ioctl

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When the move range ioctl is used, check the input and output position and
ensure that it is a non-negative value. Without this check
f2fs_get_dnode_of_data may hit a memmory bug.

Signed-off-by: Dan Robertson <dan@dlrobertson.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Dan Robertson 2020-08-30 21:45:23 +00:00 committed by Jaegeuk Kim
parent 335cac8b25
commit aad1383cbf
1 changed files with 3 additions and 0 deletions
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3
fs/f2fs/file.c
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@ -2768,6 +2768,9 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
if (IS_ENCRYPTED(src) || IS_ENCRYPTED(dst))
return -EOPNOTSUPP;
if (pos_out < 0 || pos_in < 0)
return -EINVAL;
if (src == dst) {
if (pos_in == pos_out)
return 0;