From d796588ba13b9d9301433bdf4e461ad5e60d9796 Mon Sep 17 00:00:00 2001 From: Markus Armbruster Date: Thu, 18 Apr 2019 16:53:54 +0200 Subject: [PATCH] pc-bios/s390-ccw: Clean up harmless misuse of isdigit() atoui() and get_index() pass char values to isdigit(). With a standard isdigit(), we'd get undefined behavior when the value is negative. Can't happen as char is unsigned on s390x. Even if it ould, we're actually using isdigit() from pc-bios/s390-ccw/libc.h here, which works fine for negative values. Clean up anyway, just to avoid setting a bad example. Signed-off-by: Markus Armbruster Message-Id: <20190418145355.21100-6-armbru@redhat.com> [thuth: updated the commit message] Signed-off-by: Thomas Huth --- pc-bios/s390-ccw/libc.c | 2 +- pc-bios/s390-ccw/menu.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/pc-bios/s390-ccw/libc.c b/pc-bios/s390-ccw/libc.c index a786566c4c..3187923950 100644 --- a/pc-bios/s390-ccw/libc.c +++ b/pc-bios/s390-ccw/libc.c @@ -38,7 +38,7 @@ uint64_t atoui(const char *str) } while (*str) { - if (!isdigit(*str)) { + if (!isdigit(*(unsigned char *)str)) { break; } val = val * 10 + *str - '0'; diff --git a/pc-bios/s390-ccw/menu.c b/pc-bios/s390-ccw/menu.c index 82a4ae6315..ce3815b201 100644 --- a/pc-bios/s390-ccw/menu.c +++ b/pc-bios/s390-ccw/menu.c @@ -134,7 +134,7 @@ static int get_index(void) /* Check for erroneous input */ for (i = 0; i < len; i++) { - if (!isdigit(buf[i])) { + if (!isdigit((unsigned char)buf[i])) { return -1; } }