id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
7161	hSetNewlineMode and hSetEncoding can be performed on closed and semi-closed handles	duncan		"The `hSetNewlineMode` and `hSetEncoding` functions from `GHC/IO/Handle.hs` do not check that the Handle is in an open mode. It is possible to use them on closed handles. hSetEncoding on a closed Handle triggers a segfault. Similarly, the operations are also both possible on semi-closed handles, and given the way hGetContents is implemented, this will affect the result of hGetContents which is clearly against the intention of the hGetContents/semi-closed stuff.

Both functions use the `withAllHandles__` helper. Unlike similar helpers like `wantReadableHandle_` this one doesn't do any handle mode checking.

Additionally, `hSetBuffering` and `hSetBinary` mode also use the `withAllHandles__` pattern and don't obviously check for an open handle but I've not verified this."	bug	new	normal	7.8.1	libraries/base	7.6.1-rc1				Unknown/Multiple	Unknown/Multiple	None/Unknown	Unknown