Message ID | 20240228163723.1775791-6-zhao1.liu@linux.intel.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
Series | Cleanup up to fix missing ERRP_GUARD() for error_prepend() | expand |
On 28.02.24 19:37, Zhao Liu wrote: > From: Zhao Liu<zhao1.liu@intel.com> > > As the comment in qapi/error, passing @errp to error_prepend() requires > ERRP_GUARD(): > > * = Why, when and how to use ERRP_GUARD() = > * > * Without ERRP_GUARD(), use of the @errp parameter is restricted: > ... > * - It should not be passed to error_prepend(), error_vprepend() or > * error_append_hint(), because that doesn't work with &error_fatal. > * ERRP_GUARD() lifts these restrictions. > * > * To use ERRP_GUARD(), add it right at the beginning of the function. > * @errp can then be used without worrying about the argument being > * NULL or &error_fatal. > > ERRP_GUARD() could avoid the case when @errp is the pointer of > error_fatal, the user can't see this additional information, because > exit() happens in error_setg earlier than information is added [1]. > > The nbd_co_do_receive_one_chunk() passes @errp to error_prepend() > without ERRP_GUARD(), and though its @errp parameter points to its > caller's local_err, to follow the requirement of @errp, add missing > ERRP_GUARD() at the beginning of this function. > > [1]: Issue description in the commit message of commit ae7c80a7bd73 > ("error: New macro ERRP_GUARD()"). > > Cc: Eric Blake<eblake@redhat.com> > Cc: Vladimir Sementsov-Ogievskiy<vsementsov@yandex-team.ru> > Cc: Kevin Wolf<kwolf@redhat.com> > Cc: Hanna Reitz<hreitz@redhat.com> > Signed-off-by: Zhao Liu<zhao1.liu@intel.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
diff --git a/block/nbd.c b/block/nbd.c index b9d4f935e017..ef05f7cdfd65 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -852,6 +852,7 @@ static coroutine_fn int nbd_co_do_receive_one_chunk( BDRVNBDState *s, uint64_t cookie, bool only_structured, int *request_ret, QEMUIOVector *qiov, void **payload, Error **errp) { + ERRP_GUARD(); int ret; int i = COOKIE_TO_INDEX(cookie); void *local_payload = NULL;