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Flags (PIPE_BUF_FLAG_PACKET, PIPE_BUF_FLAG_GIFT) could remain on the unused part of the pipe ring buffer. Previously splice_to_pipe() left the flags value alone, which could result in incorrect behavior. Uninitialized flags appears to have been there from the introduction of the splice syscall. Signed-off-by: Miklos Szeredi <[email protected]> Cc: <[email protected]> # 2.6.17+ Signed-off-by: Linus Torvalds <[email protected]>