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qapi/error: Check format string argument in error_*prepend()

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error_propagate_prepend() "behaves like error_prepend()", and
error_prepend() uses "formatting @fmt, ... like printf()".
error_prepend() checks its format string argument, but
error_propagate_prepend() does not. Fix by addint the format
attribute to error_propagate_prepend() and error_vprepend().

This would have caught the bug fixed in the previous commit.

Missed in commit 4b5766488f "error: Fix use of error_prepend() with
&error_fatal, &error_abort".

Inspired-by: Stefan Weil <sw@weilnetz.de>
Suggested-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200723171205.14949-1-philmd@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Commit message tweaked]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Philippe Mathieu-Daudé 2020-07-23 19:12:05 +02:00 committed by Markus Armbruster
parent 838886378e
commit 192cf54ac5
1 changed files with 4 additions and 2 deletions
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6
include/qapi/error.h
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@ -382,13 +382,15 @@ void error_propagate(Error **dst_errp, Error *local_err);
* Please use ERRP_GUARD() and error_prepend() instead when possible.
*/
void error_propagate_prepend(Error **dst_errp, Error *local_err,
const char *fmt, ...);
const char *fmt, ...)
GCC_FMT_ATTR(3, 4);
/*
* Prepend some text to @errp's human-readable error message.
* The text is made by formatting @fmt, @ap like vprintf().
*/
void error_vprepend(Error *const *errp, const char *fmt, va_list ap);
void error_vprepend(Error *const *errp, const char *fmt, va_list ap)
GCC_FMT_ATTR(2, 0);
/*
* Prepend some text to @errp's human-readable error message.