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Error reporting patches for 2020-04-04 

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Merge remote-tracking branch 'remotes/armbru/tags/pull-error-2020-04-04' into staging

Error reporting patches for 2020-04-04

# gpg: Signature made Sat 04 Apr 2020 13:19:40 BST
# gpg:                using RSA key 354BC8B3D7EB2A6B68674E5F3870B400EB918653
# gpg:                issuer "armbru@redhat.com"
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" [full]
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>" [full]
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867  4E5F 3870 B400 EB91 8653

* remotes/armbru/tags/pull-error-2020-04-04:
  qga/commands-posix: fix use after free of local_err
  dump/win_dump: fix use after free of err
  scripts/coccinelle: add error-use-after-free.cocci

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2020-04-05 18:28:17 +01:00
parent 146aa0f104 6a4a38530e
commit 547522cd3d
4 changed files with 61 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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>

4
dump/win_dump.c
View File

@ -304,13 +304,11 @@ static void restore_context(WinDumpHeader64 *h,
struct saved_context *saved_ctx)
{
int i;
Error *err = NULL;
for (i = 0; i < h->NumberProcessors; i++) {
if (cpu_memory_rw_debug(first_cpu, saved_ctx[i].addr,
(uint8_t *)&saved_ctx[i].ctx, sizeof(WinContext), 1)) {
error_setg(&err, "win-dump: failed to restore CPU #%d context", i);
warn_report_err(err);
warn_report("win-dump: failed to restore CPU #%d context", i);
}
}
}

3
qga/commands-posix.c
View File

@ -1773,6 +1773,7 @@ static void guest_suspend(SuspendMode mode, Error **errp)
}
error_free(local_err);
local_err = NULL;
if (pmutils_supports_mode(mode, &local_err)) {
mode_supported = true;
@ -1784,6 +1785,7 @@ static void guest_suspend(SuspendMode mode, Error **errp)
}
error_free(local_err);
local_err = NULL;
if (linux_sys_state_supports_mode(mode, &local_err)) {
mode_supported = true;
@ -1791,6 +1793,7 @@ static void guest_suspend(SuspendMode mode, Error **errp)
}
if (!mode_supported) {
error_free(local_err);
error_setg(errp,
"the requested suspend mode is not supported by the guest");
} else {

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, ...)
...>
}