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scripts/coccinelle: add error-use-after-free.cocci

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Add script to find and fix trivial use-after-free of Error objects.
How to use:
spatch --sp-file scripts/coccinelle/error-use-after-free.cocci \
 --macro-file scripts/cocci-macro-file.h --in-place \
 --no-show-diff ( FILES... | --use-gitgrep . )

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20200324153630.11882-2-vsementsov@virtuozzo.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Pastos in commit message and comment fixed, globbing in MAINTAINERS
expanded]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2020-03-24 18:36:25 +03:00 committed by Markus Armbruster
parent 146aa0f104
commit d1d3a99795
2 changed files with 57 additions and 0 deletions
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5
MAINTAINERS
View File

@ -2053,6 +2053,11 @@ F: include/qemu/error-report.h
F: qapi/error.json
F: util/error.c
F: util/qemu-error.c
F: scripts/coccinelle/err-bad-newline.cocci
F: scripts/coccinelle/error-use-after-free.cocci
F: scripts/coccinelle/error_propagate_null.cocci
F: scripts/coccinelle/remove_local_err.cocci
F: scripts/coccinelle/use-error_fatal.cocci
GDB stub
M: Alex Bennée <alex.bennee@linaro.org>

52
scripts/coccinelle/error-use-after-free.cocci Normal file
View File

@ -0,0 +1,52 @@
// Find and fix trivial use-after-free of Error objects
//
// Copyright (c) 2020 Virtuozzo International GmbH.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see
// <http://www.gnu.org/licenses/>.
//
// How to use:
// spatch --sp-file scripts/coccinelle/error-use-after-free.cocci \
// --macro-file scripts/cocci-macro-file.h --in-place \
// --no-show-diff ( FILES... | --use-gitgrep . )
@ exists@
identifier fn, fn2;
expression err;
@@
fn(...)
{
<...
(
error_free(err);
+ err = NULL;
|
error_report_err(err);
+ err = NULL;
|
error_reportf_err(err, ...);
+ err = NULL;
|
warn_report_err(err);
+ err = NULL;
|
warn_reportf_err(err, ...);
+ err = NULL;
)
... when != err = NULL
when != exit(...)
fn2(..., err, ...)
...>
}