tree 0c0aa271be45daf6e5bfc3abd2aa41b7cf64e7cb
parent 0ce790e7d736cedc563e1fb4e998babf5a4dbc3d
author Ben Hutchings <ben@decadent.org.uk> 1300508770 +0000
committer Michal Marek <mmarek@suse.cz> 1302257120 +0200

kconfig: Avoid buffer underrun in choice input

commit 40aee729b350672c2550640622416a855e27938f ('kconfig: fix default
value for choice input') fixed some cases where kconfig would select
the wrong option from a choice with a single valid option and thus
enter an infinite loop.

However, this broke the test for user input of the form 'N?', because
when kconfig selects the single valid option the input is zero-length
and the test will read the byte before the input buffer.  If this
happens to contain '?' (as it will in a mips build on Debian unstable
today) then kconfig again enters an infinite loop.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: stable@kernel.org [2.6.17+]
Signed-off-by: Michal Marek <mmarek@suse.cz>