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bhyve: Address uses of uninitialized variables in pci_nvme.c

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The debug print in nvme_opc_get_log_page() would print an uninitialized
local variable.

In nvme_opc_write_read(), a failed LBA bounds check would cause
pci_nvme_stats_write_read_update() to be called with an uninitialized
variable as a parameter.  Although the parameter is unused when the
check fails (and so status != 0), LLVM 14 emits some bogus machine code
in this path, which happens to result in a segfault when it gets
executed.

PR:		265749
Reviewed by:	chuck, emaste
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D36119
This commit is contained in:
Mark Johnston 2022-08-14 11:57:24 -04:00
parent af86d12c80
commit b6ecef28bf
1 changed files with 10 additions and 10 deletions
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20
usr.sbin/bhyve/pci_nvme.c
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@ -1418,9 +1418,7 @@ nvme_opc_get_log_page(struct pci_nvme_softc* sc, struct nvme_command* command,
{
uint64_t logoff;
uint32_t logsize;
uint8_t logpage = command->cdw10 & 0xFF;
DPRINTF("%s log page %u len %u", __func__, logpage, logsize);
uint8_t logpage;
pci_nvme_status_genc(&compl->status, NVME_SC_SUCCESS);
@ -1428,10 +1426,13 @@ nvme_opc_get_log_page(struct pci_nvme_softc* sc, struct nvme_command* command,
* Command specifies the number of dwords to return in fields NUMDU
* and NUMDL. This is a zero-based value.
*/
logpage = command->cdw10 & 0xFF;
logsize = ((command->cdw11 << 16) | (command->cdw10 >> 16)) + 1;
logsize *= sizeof(uint32_t);
logoff = ((uint64_t)(command->cdw13) << 32) | command->cdw12;
DPRINTF("%s log page %u len %u", __func__, logpage, logsize);
switch (logpage) {
case NVME_LOG_ERROR:
if (logoff >= sizeof(sc->err_log)) {
@ -2507,6 +2508,12 @@ nvme_opc_write_read(struct pci_nvme_softc *sc,
lba = ((uint64_t)cmd->cdw11 << 32) | cmd->cdw10;
nblocks = (cmd->cdw12 & 0xFFFF) + 1;
bytes = nblocks << nvstore->sectsz_bits;
if (bytes > NVME_MAX_DATA_SIZE) {
WPRINTF("%s command would exceed MDTS", __func__);
pci_nvme_status_genc(status, NVME_SC_INVALID_FIELD);
goto out;
}
if (pci_nvme_out_of_range(nvstore, lba, nblocks)) {
WPRINTF("%s command would exceed LBA range(slba=%#lx nblocks=%#lx)",
@ -2515,13 +2522,6 @@ nvme_opc_write_read(struct pci_nvme_softc *sc,
goto out;
}
bytes = nblocks << nvstore->sectsz_bits;
if (bytes > NVME_MAX_DATA_SIZE) {
WPRINTF("%s command would exceed MDTS", __func__);
pci_nvme_status_genc(status, NVME_SC_INVALID_FIELD);
goto out;
}
offset = lba << nvstore->sectsz_bits;
req->bytes = bytes;