From e144a605a614d22165000c69e8e1dc6986d45cd8 Mon Sep 17 00:00:00 2001 From: Salvador Fandino Date: Thu, 23 Jan 2020 20:36:26 +0100 Subject: qemu_set_log_filename: filename argument may be NULL NULL is a valid log filename used to indicate we want to use stderr but qemu_set_log_filename (which is called by bsd-user/main.c) was not handling it correctly. That also made redundant a couple of NULL checks in calling code which have been removed. Signed-off-by: Salvador Fandino Message-Id: <20200123193626.19956-1-salvador@qindel.com> Signed-off-by: Stefan Hajnoczi --- util/log.c | 28 ++++++++++++++++------------ 1 file changed, 16 insertions(+), 12 deletions(-) (limited to 'util/log.c') diff --git a/util/log.c b/util/log.c index 867264da8d..47f2827397 100644 --- a/util/log.c +++ b/util/log.c @@ -148,25 +148,29 @@ void qemu_log_needs_buffers(void) * Allow the user to include %d in their logfile which will be * substituted with the current PID. This is useful for debugging many * nested linux-user tasks but will result in lots of logs. + * + * filename may be NULL. In that case, log output is sent to stderr */ void qemu_set_log_filename(const char *filename, Error **errp) { - char *pidstr; g_free(logfilename); logfilename = NULL; - pidstr = strstr(filename, "%"); - if (pidstr) { - /* We only accept one %d, no other format strings */ - if (pidstr[1] != 'd' || strchr(pidstr + 2, '%')) { - error_setg(errp, "Bad logfile format: %s", filename); - return; - } else { - logfilename = g_strdup_printf(filename, getpid()); - } - } else { - logfilename = g_strdup(filename); + if (filename) { + char *pidstr = strstr(filename, "%"); + if (pidstr) { + /* We only accept one %d, no other format strings */ + if (pidstr[1] != 'd' || strchr(pidstr + 2, '%')) { + error_setg(errp, "Bad logfile format: %s", filename); + return; + } else { + logfilename = g_strdup_printf(filename, getpid()); + } + } else { + logfilename = g_strdup(filename); + } } + qemu_log_close(); qemu_set_log(qemu_loglevel); } -- cgit v1.2.3