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qtest.c: Allow zero size in memset qtest commands

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Some tests use the qtest protocol "memset" command with a zero
size, expecting it to do nothing. However in the current code this
will result in calling memset() with a NULL pointer, which is
undefined behaviour. Detect and specially handle zero sizes to
avoid this.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1470393800-7882-1-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2016-08-05 11:43:20 +01:00
parent 33e60e0198
commit 5f31bbf101
1 changed files with 7 additions and 4 deletions
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qtest.c
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@ -133,6 +133,7 @@ static bool qtest_opened;
* < OK
*
* ADDR, SIZE, VALUE are all integers parsed with strtoul() with a base of 0.
* For 'memset' a zero size is permitted and does nothing.
*
* DATA is an arbitrarily long hex number prefixed with '0x'. If it's smaller
* than the expected size, the value will be zero filled at the end of the data
@ -493,10 +494,12 @@ static void qtest_process_command(CharDriverState *chr, gchar **words)
len = strtoull(words[2], NULL, 0);
pattern = strtoull(words[3], NULL, 0);
if (len) {
data = g_malloc(len);
memset(data, pattern, len);
cpu_physical_memory_write(addr, data, len);
g_free(data);
}
qtest_send_prefix(chr);
qtest_send(chr, "OK\n");