libbb: fix potential NULL pointer use

function                                             old     new   delta
unicode_conv_to_printable2                           193     216     +23

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/libbb/unicode.c b/libbb/unicode.c
index 9c4da50d3b20639b8f489bb69dc41b60583dc1b2..d378175a4f0ca381f9a2e1054be30e71dcc85c4f 100644 (file)
--- a/libbb/unicode.c
+++ b/libbb/unicode.c
@@ -1121,6 +1121,8 @@ static char* FAST_FUNC unicode_conv_to_printable2(uni_stat_t *stats, const char
                        dst[dst_len++] = ' ';
                }
        }
+       if (!dst) /* for example, if input was "" */
+               dst = xzalloc(1);
        dst[dst_len] = '\0';
        if (stats) {
                stats->byte_count = dst_len;