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Fix potential overflow or underflow of offset in INodeFile's seek

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LI Qing 2020-01-17 09:55:38 +00:00 committed by Tate, Hongliang Tian
parent 449ba1d5d9
commit d825351f02
1 changed files with 12 additions and 4 deletions
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16
src/libos/src/fs/inode_file.rs
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@ -96,11 +96,19 @@ impl File for INodeFile {
fn seek(&self, pos: SeekFrom) -> Result<off_t> {
let mut offset = self.offset.lock().unwrap();
*offset = match pos {
SeekFrom::Start(off) => off as usize,
SeekFrom::End(off) => (self.inode.metadata()?.size as i64 + off) as usize,
SeekFrom::Current(off) => (*offset as i64 + off) as usize,
let new_offset = match pos {
SeekFrom::Start(off) => off as i64,
SeekFrom::End(off) => (self.inode.metadata()?.size as i64)
.checked_add(off)
.ok_or_else(|| errno!(EOVERFLOW, "file offset overflow"))?,
SeekFrom::Current(off) => (*offset as i64)
.checked_add(off)
.ok_or_else(|| errno!(EOVERFLOW, "file offset overflow"))?,
};
if new_offset < 0 {
return_errno!(EINVAL, "file offset is negative");
}
*offset = new_offset as usize;
Ok(*offset as i64)
}