Initialize to zero only size + check for null

diff --git a/libarchive/archive_read_support_format_rar5.c b/libarchive/archive_read_support_format_rar5.c
index 2eff80ca21405482bbc201f53e46afdc7c8d5e23..2c36db314702a0763c375382054228415906fc5d 100644 (file)
--- a/libarchive/archive_read_support_format_rar5.c
+++ b/libarchive/archive_read_support_format_rar5.c
@@ -3906,8 +3906,8 @@ static int rar5_read_data(struct archive_read *a, const void **buff,
        int ret;
        struct rar5* rar = get_context(a);
 
-       *offset = 0;
-       *size = 0;
+       if (size)
+               *size = 0;
 
        if(rar->file.dir > 0) {
                /* Don't process any data if this file entry was declared