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gbytes: Avoid memcmp (NULL, ., 0) or memcmp (., NULL, 0)

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Similar to 3837b83f, glibc memcmp is declared with the first two
arguments annotated as non-null via an attribute, which results in the
undefined behaviour sanitizer considering it to be UB to pass a null
pointer there (even if we are comparing 0 bytes, and hence not actually
dereferencing the pointer).

This shows up in /gvariant/serialiser/children when run with the
undefined behaviour sanitizer.

Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie 2019-11-04 13:41:14 +00:00
parent 2465e64c93
commit 8235bbe467
1 changed files with 1 additions and 1 deletions
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glib/gbytes.c
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@ -365,7 +365,7 @@ g_bytes_equal (gconstpointer bytes1,
g_return_val_if_fail (bytes2 != NULL, FALSE);
return b1->size == b2->size &&
memcmp (b1->data, b2->data, b1->size) == 0;
(b1->size == 0 || memcmp (b1->data, b2->data, b1->size) == 0);
}
/**