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qtest: Avoid passing raw strings through hmp() 

hmp() passes its string argument through the sprintf() family;
with a proper attribute, gcc -Wformat warns us when we do something
dangerous like passing a non-constant format string.  Fortunately,
all our strings were safe, but checking whether the string can
contain an unintended % is easy to avoid and therefore worth doing.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Eric Blake 2017-09-11 12:20:14 -05:00 committed by Thomas Huth
parent 4fb609adc9
commit 7b899f4dd5
2 changed files with 6 additions and 6 deletions
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8
tests/libqtest.h
View File

@ -134,14 +134,14 @@ QDict *qtest_qmp_eventwait_ref(QTestState *s, const char *event);
/** /**
* qtest_hmp: * qtest_hmp:
* @s: #QTestState instance to operate on. * @s: #QTestState instance to operate on.
* @fmt...: HMP command to send to QEMU * @fmt...: HMP command to send to QEMU, formats arguments like sprintf().
* *
* Send HMP command to QEMU via QMP's human-monitor-command. * Send HMP command to QEMU via QMP's human-monitor-command.
* QMP events are discarded. * QMP events are discarded.
* *
* Returns: the command's output. The caller should g_free() it. * Returns: the command's output. The caller should g_free() it.
*/ */
char *qtest_hmp(QTestState *s, const char *fmt, ...); char *qtest_hmp(QTestState *s, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
/** /**
* qtest_hmpv: * qtest_hmpv:
@ -592,13 +592,13 @@ static inline QDict *qmp_eventwait_ref(const char *event)
/** /**
* hmp: * hmp:
* @fmt...: HMP command to send to QEMU * @fmt...: HMP command to send to QEMU, formats arguments like sprintf().
* *
* Send HMP command to QEMU via QMP's human-monitor-command. * Send HMP command to QEMU via QMP's human-monitor-command.
* *
* Returns: the command's output. The caller should g_free() it. * Returns: the command's output. The caller should g_free() it.
*/ */
char *hmp(const char *fmt, ...); char *hmp(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
/** /**
* get_irq: * get_irq:

4
tests/test-hmp.c
View File

@ -81,7 +81,7 @@ static void test_commands(void)
if (verbose) { if (verbose) {
fprintf(stderr, "\t%s\n", hmp_cmds[i]); fprintf(stderr, "\t%s\n", hmp_cmds[i]);
} }
response = hmp(hmp_cmds[i]); response = hmp("%s", hmp_cmds[i]);
g_free(response); g_free(response);
} }
@ -104,7 +104,7 @@ static void test_info_commands(void)
if (verbose) { if (verbose) {
fprintf(stderr, "\t%s\n", info); fprintf(stderr, "\t%s\n", info);
} }
resp = hmp(info); resp = hmp("%s", info);
g_free(resp); g_free(resp);
/* And move forward to the next line */ /* And move forward to the next line */
info = strchr(endp + 1, '\n'); info = strchr(endp + 1, '\n');