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migration: fix RAMBlock add NULL check 

qemu_ram_block_from_host() may return NULL, which will be dereferenced w/o
check. Usualy return value is checked for this function.
Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Dmitry Frolov <frolov@swemel.ru>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231010104851.802947-1-frolov@swemel.ru>
master
Dmitry Frolov 2023-10-10 13:48:53 +03:00 committed by Juan Quintela
parent 8b2395970a
commit f75ed59f40
1 changed files with 5 additions and 0 deletions
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5
migration/ram.c
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@ -4285,6 +4285,11 @@ static void ram_mig_ram_block_resized(RAMBlockNotifier *n, void *host,
RAMBlock *rb = qemu_ram_block_from_host(host, false, &offset);
Error *err = NULL;
if (!rb) {
error_report("RAM block not found");
return;
}
if (migrate_ram_is_ignored(rb)) {
return;
}