From 17b45e684af98c1cf37648ad05a98d500b367c5a Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Tue, 28 Mar 2023 08:34:13 +1300 Subject: cli: Correct several bugs in cli_getch() This function does not behave as expected when unknown escape sequences are sent to it: - it fails to store (and thus echo) the last character of the invalid sequence - it fails to set esc_len to 0 when it finishes emitting the invalid sequence, meaning that the following character will appear to be part of a new escape sequence - it processes the first character of the rejected sequence as a valid character, just starting the sequence all over again The last two bugs conspire to produce an "impossible condition #876" message which is the main symptom of this behaviour. Fix these bugs and add a test to verify the behaviour. Signed-off-by: Simon Glass Reported-by: Heinrich Schuchardt --- common/cli_getch.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'common') diff --git a/common/cli_getch.c b/common/cli_getch.c index 87c23edcf4..61d4cb261b 100644 --- a/common/cli_getch.c +++ b/common/cli_getch.c @@ -129,7 +129,7 @@ static int cli_ch_esc(struct cli_ch_state *cch, int ichar, *actp = act; - return act == ESC_CONVERTED ? ichar : 0; + return ichar; } int cli_ch_process(struct cli_ch_state *cch, int ichar) @@ -145,6 +145,7 @@ int cli_ch_process(struct cli_ch_state *cch, int ichar) return cch->esc_save[cch->emit_upto++]; cch->emit_upto = 0; cch->emitting = false; + cch->esc_len = 0; } return 0; } else if (ichar == -ETIMEDOUT) { @@ -185,7 +186,7 @@ int cli_ch_process(struct cli_ch_state *cch, int ichar) cch->esc_save[cch->esc_len++] = ichar; ichar = cch->esc_save[cch->emit_upto++]; cch->emitting = true; - break; + return ichar; case ESC_CONVERTED: /* valid escape sequence, return the resulting char */ cch->esc_len = 0; -- cgit v1.2.1