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ivshmem: do not keep shm_fd open 

Remove shm_fd from device state, closing it as early as possible to avoid leaks.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Claudio Fontana <claudio.fontana@huawei.com>
This commit is contained in:
Marc-André Lureau 2015-06-30 00:04:19 +02:00
parent ddef6a0d68
commit f689d2811a
1 changed files with 5 additions and 11 deletions
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16
hw/misc/ivshmem.c
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@ -88,7 +88,6 @@ typedef struct IVShmemState {
MemoryRegion ivshmem;
uint64_t ivshmem_size; /* size of shared memory region */
uint32_t ivshmem_64bit;
int shm_fd; /* shared memory file descriptor */
Peer *peers;
int nb_peers; /* how many peers we have space for */
@ -235,7 +234,7 @@ static uint64_t ivshmem_io_read(void *opaque, hwaddr addr,
case IVPOSITION:
/* return my VM ID if the memory is mapped */
if (s->shm_fd >= 0) {
if (memory_region_is_mapped(&s->ivshmem)) {
ret = s->vm_id;
} else {
ret = -1;
@ -356,8 +355,6 @@ static int create_shared_memory_BAR(IVShmemState *s, int fd, uint8_t attr,
return -1;
}
s->shm_fd = fd;
memory_region_init_ram_ptr(&s->ivshmem, OBJECT(s), "ivshmem.bar2",
s->ivshmem_size, ptr);
vmstate_register_ram(&s->ivshmem, DEVICE(s));
@ -535,7 +532,7 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
if (incoming_posn == -1) {
void * map_ptr;
if (s->shm_fd >= 0) {
if (memory_region_is_mapped(&s->ivshmem)) {
error_report("shm already initialized");
close(incoming_fd);
return;
@ -564,9 +561,7 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
/* only store the fd if it is successfully mapped */
s->shm_fd = incoming_fd;
close(incoming_fd);
return;
}
@ -706,8 +701,6 @@ static void pci_ivshmem_realize(PCIDevice *dev, Error **errp)
PCI_BASE_ADDRESS_MEM_PREFETCH;
Error *local_err = NULL;
s->shm_fd = -1;
if (s->sizearg == NULL) {
s->ivshmem_size = 4 << 20; /* 4 MB default */
} else {
@ -829,6 +822,7 @@ static void pci_ivshmem_realize(PCIDevice *dev, Error **errp)
}
create_shared_memory_BAR(s, fd, attr, errp);
close(fd);
}
}
@ -844,7 +838,7 @@ static void pci_ivshmem_exit(PCIDevice *dev)
error_free(s->migration_blocker);
}
if (s->shm_fd >= 0) {
if (memory_region_is_mapped(&s->ivshmem)) {
void *addr = memory_region_get_ram_ptr(&s->ivshmem);
vmstate_unregister_ram(&s->ivshmem, DEVICE(dev));