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qemu-char: avoid leaking unused fds in tcp_get_msgfds()

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Commit c76bf6bb8f ("Add chardev API
qemu_chr_fe_get_msgfds") extended the get_msgfds API from one to
multiple file descriptors.  It forgot to close unused file descriptors
before freeing the file descriptor array.

This patch prevents a file descriptor leak if the tcp_get_msgfds()
callers requests fewer file descriptors than are available.

Cc: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2014-06-22 10:38:37 +08:00 committed by Michael S. Tsirkin
parent 4f85861441
commit d2fc39b420
1 changed files with 7 additions and 0 deletions
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7
qemu-char.c
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@ -2481,8 +2481,15 @@ static int tcp_get_msgfds(CharDriverState *chr, int *fds, int num)
int to_copy = (s->read_msgfds_num < num) ? s->read_msgfds_num : num;
if (to_copy) {
int i;
memcpy(fds, s->read_msgfds, to_copy * sizeof(int));
/* Close unused fds */
for (i = to_copy; i < s->read_msgfds_num; i++) {
close(s->read_msgfds[i]);
}
g_free(s->read_msgfds);
s->read_msgfds = 0;
s->read_msgfds_num = 0;