[renesas-drivers:topic/renesas-overlays 23/108] drivers/of/dynamic.c:1076 of_changeset_add_property_stringf() error: potential null dereference 'str'. (kvasprintf returns null)

[kbuild test robot]

tree:   
https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git 
topic/renesas-overlays
head:   c991b7bbdc862ab5c1a7edf88d04105fa081e2fc
commit: e068b1eab7180587d15bbc55abdc5851b7f216dc [23/108] of: changesets: 
Introduce changeset helper methods

smatch warnings:
show-warning-context "warning-lines" files

vim +/str +1076 drivers/of/dynamic.c

  1050  
  1051  /**
  1052   * of_changeset_add_property_stringf - Create a new formatted string 
property
  1053   *
  1054   * @ocs:        changeset pointer
  1055   * @np:         device node pointer
  1056   * @name:       name of the property
  1057   * @fmt:        format of string property
  1058   * ...          arguments of the format string
  1059   *
  1060   * Adds a string property to the changeset by making copies of the name
  1061   * and the formatted value.
  1062   *
  1063   * Returns zero on success, a negative error value otherwise.
  1064   */
  1065  int of_changeset_add_property_stringf(struct of_changeset *ocs,
  1066                  struct device_node *np, const char *name, const char 
*fmt, ...)
  1067  {
  1068          va_list vargs;
  1069          char *str;
  1070          int ret;
  1071  
  1072          va_start(vargs, fmt);
  1073          str = kvasprintf(GFP_KERNEL, fmt, vargs);
  1074          va_end(vargs);
  1075  
> 1076          ret = of_changeset_add_property_string(ocs, np, name, str);
  1077  
  1078          kfree(str);
  1079          return ret;
  1080  }
  1081  

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