From: Chris Hofstaedtler Date: Tue, 31 Oct 2023 13:52:26 +0000 (+0100) Subject: setterm: avoid restoring flags from uninitialized memory X-Git-Tag: archive/raspbian/2.40.2-8+rpi1~1^2^2^2^2^2^2^2^2^2^2^2^2~2 X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=49d0f2e90cc64849b9f76f7b19c669ed2b68efdd;p=util-linux.git setterm: avoid restoring flags from uninitialized memory Depending on the used compiler and flags, previously either F_SETFL was called with 0 or with a random value. Never with the intended previous flags. [kzak@redhat.com: - tiny coding style change] Signed-off-by: Chris Hofstaedtler Tested-by: Emanuele Rocca Signed-off-by: Karel Zak Gbp-Pq: Topic upstream Gbp-Pq: Name setterm-resize-uninit-flags.patch --- diff --git a/term-utils/setterm.c b/term-utils/setterm.c index 22afc76..e91abc9 100644 --- a/term-utils/setterm.c +++ b/term-utils/setterm.c @@ -846,7 +846,10 @@ static void tty_raw(struct termios *saved_attributes, int *saved_fl) { struct termios tattr; - fcntl(STDIN_FILENO, F_GETFL, saved_fl); + *saved_fl = fcntl(STDIN_FILENO, F_GETFL); + if (*saved_fl == -1) + err(EXIT_FAILURE, _("fcntl failed")); + tcgetattr(STDIN_FILENO, saved_attributes); fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK); memcpy(&tattr, saved_attributes, sizeof(struct termios)); @@ -898,7 +901,7 @@ static int resizetty(void) ssize_t rc; struct winsize ws; struct termios saved_attributes; - int saved_fl; + int saved_fl = 0; if (!isatty(STDIN_FILENO)) errx(EXIT_FAILURE, _("stdin does not refer to a terminal"));