mirror of https://gerrit.osmocom.org/libosmocore
osmo_io_uring: Detach msghdr from iofd before calling iofd_handle_send_completion()
msghdr must be detached, because subsequent callback at iofd_handle_send_completion() may destroy the iofd (which in turn frees this msghdr, if still attached) and frees the msghdr, causing a double free. Related: OS#5751 Change-Id: Ia349f73de2145fa360b20dd40deb73a8ffc71f07
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@ -195,6 +195,13 @@ static void iofd_uring_handle_tx(struct iofd_msghdr *msghdr, int rc)
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{
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struct osmo_io_fd *iofd = msghdr->iofd;
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/* Detach msghdr from iofd. It might get freed here or it will be freed at iofd_handle_send_completion().
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* If there is pending data to send, iofd_uring_submit_tx() will attach it again.
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* iofd_handle_send_completion() will free msghdr at the end. the previous callback function may destroy iofd.
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* If msghdr would be attached to iofd, it could be freed twice, causing a double free error. */
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if (iofd->u.uring.write_msghdr == msghdr)
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iofd->u.uring.write_msghdr = NULL;
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if (OSMO_UNLIKELY(IOFD_FLAG_ISSET(iofd, IOFD_FLAG_CLOSED))) {
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msgb_free(msghdr->msg);
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iofd_msghdr_free(msghdr);
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@ -202,7 +209,6 @@ static void iofd_uring_handle_tx(struct iofd_msghdr *msghdr, int rc)
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iofd_handle_send_completion(iofd, rc, msghdr);
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}
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iofd->u.uring.write_msghdr = NULL;
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/* submit the next to-be-transmitted message for this file descriptor */
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if (iofd->u.uring.write_enabled && !IOFD_FLAG_ISSET(iofd, IOFD_FLAG_CLOSED))
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iofd_uring_submit_tx(iofd);
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