mirror of https://gerrit.osmocom.org/libosmocore
vty: Avoid use-after-free in VTY telnet interface
If the read callback closes the connection conn is already freed so we can't derefernce it. Instead return -EBADFD in the read function if it closed the connection and check for that.
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@ -120,7 +120,7 @@ static int client_data(struct osmo_fd *fd, unsigned int what)
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}
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/* vty might have been closed from vithin vty_read() */
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if (!conn->vty)
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if (rc == -EBADFD)
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return rc;
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if (what & BSC_FD_WRITE) {
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@ -193,7 +193,6 @@ void vty_event(enum event event, int sock, struct vty *vty)
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break;
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case VTY_CLOSED:
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/* vty layer is about to free() vty */
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connection->vty = NULL;
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telnet_close_client(bfd);
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break;
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default:
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@ -1432,9 +1432,10 @@ int vty_read(struct vty *vty)
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}
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/* Check status. */
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if (vty->status == VTY_CLOSE)
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if (vty->status == VTY_CLOSE) {
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vty_close(vty);
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else {
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return -EBADFD;
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} else {
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vty_event(VTY_WRITE, vty_sock, vty);
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vty_event(VTY_READ, vty_sock, vty);
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}
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