From 8f4d9555823636c329cb40afc6f36969ec5d35e4 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Date: Mon, 29 Jun 2020 09:08:58 +0200 Subject: [PATCH] util/qemu-option: Document the get_opt_value() function MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Coverity noticed commit 950c4e6c94 introduced a dereference before null check in get_opt_value (CID1391003): In get_opt_value: All paths that lead to this null pointer comparison already dereference the pointer earlier (CWE-476) We fixed this in commit 6e3ad3f0e31, but relaxed the check in commit 0c2f6e7ee99 because "No callers of get_opt_value() pass in a NULL for the 'value' parameter". Since this function is publicly exposed, it risks new users to do the same error again. Avoid that documenting the 'value' argument must not be NULL. Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Daniel P. Berrangé Message-Id: <20200629070858.19850-1-philmd@redhat.com> Signed-off-by: Laurent Vivier --- include/qemu/option.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/qemu/option.h b/include/qemu/option.h index eb4097889d..ac50d25774 100644 --- a/include/qemu/option.h +++ b/include/qemu/option.h @@ -28,6 +28,19 @@ #include "qemu/queue.h" +/** + * get_opt_value + * @p: a pointer to the option name, delimited by commas + * @value: a non-NULL pointer that will received the delimited options + * + * The @value char pointer will be allocated and filled with + * the delimited options. + * + * Returns the position of the comma delimiter/zero byte after the + * option name in @p. + * The memory pointer in @value must be released with a call to g_free() + * when no longer required. + */ const char *get_opt_value(const char *p, char **value); void parse_option_size(const char *name, const char *value,