The branch stable/13 has been updated by jhb: URL: https://cgit.FreeBSD.org/src/commit/?id=411ea77fed696c6e93696b13d633a49317f05113
commit 411ea77fed696c6e93696b13d633a49317f05113 Author: John Baldwin <[email protected]> AuthorDate: 2023-01-19 18:21:50 +0000 Commit: John Baldwin <[email protected]> CommitDate: 2023-01-26 22:18:44 +0000 bhyve: Avoid triggering false -Wfree-nonheap-object warnings. XHCI port and slot numbers are 1-based rather than 0-based. To handle this, bhyve was subtracting one item from the pointers saved in the softc so that index 1 accessed index 0 of the allocated array. However, this is UB and confused GCC 12. The compiler noticed that the calls to free() were using an offset and emitted a warning. Rather than storing UB pointers in the softc, push the decrement operation into the existing macros that wrap accesses to the relevant arrays. Reviewed by: corvink, markj Differential Revision: https://reviews.freebsd.org/D36829 (cherry picked from commit b36b14beda4ff7ecbb906ada756141f76fcb81aa) --- usr.sbin/bhyve/pci_xhci.c | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-) diff --git a/usr.sbin/bhyve/pci_xhci.c b/usr.sbin/bhyve/pci_xhci.c index 5bc9498a4eb4..1eceb6fe0fd3 100644 --- a/usr.sbin/bhyve/pci_xhci.c +++ b/usr.sbin/bhyve/pci_xhci.c @@ -290,10 +290,10 @@ struct pci_xhci_softc { }; -/* portregs and devices arrays are set up to start from idx=1 */ -#define XHCI_PORTREG_PTR(x,n) &(x)->portregs[(n)] -#define XHCI_DEVINST_PTR(x,n) (x)->devices[(n)] -#define XHCI_SLOTDEV_PTR(x,n) (x)->slots[(n)] +/* port and slot numbering start from 1 */ +#define XHCI_PORTREG_PTR(x,n) &((x)->portregs[(n) - 1]) +#define XHCI_DEVINST_PTR(x,n) ((x)->devices[(n) - 1]) +#define XHCI_SLOTDEV_PTR(x,n) ((x)->slots[(n) - 1]) #define XHCI_HALTED(sc) ((sc)->opregs.usbsts & XHCI_STS_HCH) @@ -2738,10 +2738,6 @@ pci_xhci_parse_devices(struct pci_xhci_softc *sc, nvlist_t *nvl) sc->devices = calloc(XHCI_MAX_DEVS, sizeof(struct pci_xhci_dev_emu *)); sc->slots = calloc(XHCI_MAX_SLOTS, sizeof(struct pci_xhci_dev_emu *)); - /* port and slot numbering start from 1 */ - sc->devices--; - sc->slots--; - ndevices = 0; slots_nvl = find_relative_config_node(nvl, "slot"); @@ -2835,7 +2831,6 @@ pci_xhci_parse_devices(struct pci_xhci_softc *sc, nvlist_t *nvl) portsfinal: sc->portregs = calloc(XHCI_MAX_DEVS, sizeof(struct pci_xhci_portregs)); - sc->portregs--; if (ndevices > 0) { for (i = 1; i <= XHCI_MAX_DEVS; i++) { @@ -2851,8 +2846,8 @@ bad: free(XHCI_DEVINST_PTR(sc, i)); } - free(sc->devices + 1); - free(sc->slots + 1); + free(sc->devices); + free(sc->slots); return (-1); }
