Avoid truncation of a 64-bit long to a 32-bit int, and check for errno (especially ERANGE).
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com> --- v1->v2: clear errno before strtol --- util/cutils.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/util/cutils.c b/util/cutils.c index dbe7412..9312e45 100644 --- a/util/cutils.c +++ b/util/cutils.c @@ -523,16 +523,17 @@ int parse_debug_env(const char *name, int max, int initial) { char *debug_env = getenv(name); char *inv = NULL; - int debug; + long debug; if (!debug_env) { return initial; } + errno = 0; debug = strtol(debug_env, &inv, 10); if (inv == debug_env) { return initial; } - if (debug < 0 || debug > max) { + if (debug < 0 || debug > max || errno != 0) { fprintf(stderr, "warning: %s not in [0, %d]", name, max); return initial; } -- 1.8.3.1