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ivshmem: Inline check_shm_size() into its only caller 

Improve the error messages while there.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1458066895-20632-34-git-send-email-armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
This commit is contained in:
Markus Armbruster 2016-03-15 19:34:48 +01:00
parent c2d8019cd7
commit 8baeb22bfc
1 changed files with 11 additions and 26 deletions
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37
hw/misc/ivshmem.c
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@ -343,29 +343,6 @@ static void watch_vector_notifier(IVShmemState *s, EventNotifier *n,
NULL, &s->msi_vectors[vector]); NULL, &s->msi_vectors[vector]);
} }
static int check_shm_size(IVShmemState *s, int fd, Error **errp)
{
/* check that the guest isn't going to try and map more memory than the
* the object has allocated return -1 to indicate error */
struct stat buf;
if (fstat(fd, &buf) < 0) {
error_setg(errp, "exiting: fstat on fd %d failed: %s",
fd, strerror(errno));
return -1;
}
if (s->ivshmem_size > buf.st_size) {
error_setg(errp, "Requested memory size greater"
" than shared object size (%zu > %" PRIu64")",
s->ivshmem_size, (uint64_t)buf.st_size);
return -1;
} else {
return 0;
}
}
static void ivshmem_add_eventfd(IVShmemState *s, int posn, int i) static void ivshmem_add_eventfd(IVShmemState *s, int posn, int i)
{ {
memory_region_add_eventfd(&s->ivshmem_mmio, memory_region_add_eventfd(&s->ivshmem_mmio,
@ -480,7 +457,7 @@ static void setup_interrupt(IVShmemState *s, int vector, Error **errp)
static void process_msg_shmem(IVShmemState *s, int fd, Error **errp) static void process_msg_shmem(IVShmemState *s, int fd, Error **errp)
{ {
Error *err = NULL; struct stat buf;
void *ptr; void *ptr;
if (s->ivshmem_bar2) { if (s->ivshmem_bar2) {
@ -489,8 +466,16 @@ static void process_msg_shmem(IVShmemState *s, int fd, Error **errp)
return; return;
} }
if (check_shm_size(s, fd, &err) == -1) { if (fstat(fd, &buf) < 0) {
error_propagate(errp, err); error_setg_errno(errp, errno,
"can't determine size of shared memory sent by server");
close(fd);
return;
}
if (s->ivshmem_size > buf.st_size) {
error_setg(errp, "server sent only %zd bytes of shared memory",
(size_t)buf.st_size);
close(fd); close(fd);
return; return;
} }