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dump: enhance dump_state_prepare fd initialization

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Initializing descriptor with zero is unsafe: during cleanup we risk to
unconditional close of fd == 0 in case dump state wasn't fully
initialized. Thus, let's init fd with -1 value and check its value
before closing it.

Signed-off-by: Nikolai Barybin <nikolai.barybin@virtuozzo.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20250911123656.413160-2-nikolai.barybin@virtuozzo.com>
This commit is contained in:
Nikolai Barybin
2025-09-11 15:36:55 +03:00
committed by Marc-André Lureau
parent c141bcb6af
commit 8114cd44c8
1 changed files with 6 additions and 3 deletions
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9
dump/dump.c
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@@ -104,7 +104,10 @@ static int dump_cleanup(DumpState *s)
guest_phys_blocks_free(&s->guest_phys_blocks);
memory_mapping_list_free(&s->list);
close(s->fd);
if (s->fd != -1) {
close(s->fd);
}
s->fd = -1;
g_free(s->guest_note);
g_clear_pointer(&s->string_table_buf, g_array_unref);
s->guest_note = NULL;
@@ -1709,8 +1712,8 @@ static DumpState dump_state_global = { .status = DUMP_STATUS_NONE };
static void dump_state_prepare(DumpState *s)
{
/* zero the struct, setting status to active */
*s = (DumpState) { .status = DUMP_STATUS_ACTIVE };
/* zero the struct, setting status to active and fd to -1 */
*s = (DumpState) { .fd = -1, .status = DUMP_STATUS_ACTIVE };
}
bool qemu_system_dump_in_progress(void)