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commit d7fe75cbc23c7d225eee2ef04def239b6603dce7 upstream.
The ICANON case is a bit messy, since it has to look for the line
ending, and has special code to then suppress line ending characters if
they match the __DISABLED_CHAR. So it actually looks up the line ending
even past the point where it knows it won't copy it to the result
buffer.
That said, apart from all those odd legacy N_TTY ICANON cases, the
actual "should we continue copying" logic isn't really all that
complicated or different from the non-canon case. In fact, the lack of
"wait for at least N characters" arguably makes the repeat case slightly
simpler. It really just boils down to "there's more of the line to be
copied".
So add the necessarily trivial logic, and now the N_TTY case will give
long result lines even when in canon mode.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>