xfs: avoid null *src in memcpy call in xlog_write

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The gcc undefined behavior sanitizer caught this; surely
any sane memcpy implementation will no-op if size == 0,
but behavior with a *src of NULL is technically undefined
(declared nonnull), so avoid it here.

We are actually in this situation frequently via
xlog_commit_record(), because:

        struct xfs_log_iovec reg = {
                .i_addr = NULL,
                .i_len = 0,
                .i_type = XLOG_REG_TYPE_COMMIT,
        };

Reported-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

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Eric Sandeen 2015-10-12 16:04:15 +11:00 • committed by Dave Chinner

parent dbd5c8c9a2

commit 91f9f5fe1e

1 changed files with 13 additions and 4 deletions

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fs/xfs/xfs_log.c

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