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megasas: fix guest-triggered memory leak

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If the guest sets the sglist size to a value >=2GB, megasas_handle_dcmd
will return MFI_STAT_MEMORY_NOT_AVAILABLE without freeing the memory.
Avoid this by returning only the status from map_dcmd, and loading
cmd->iov_size in the caller.

Reported-by: Li Qiang <liqiang6-s@360.cn>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-01-02 11:03:33 +01:00
parent bf7bb91e3c
commit 765a707000
1 changed files with 6 additions and 5 deletions
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11
hw/scsi/megasas.c
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@ -683,14 +683,14 @@ static int megasas_map_dcmd(MegasasState *s, MegasasCmd *cmd)
trace_megasas_dcmd_invalid_sge(cmd->index,
cmd->frame->header.sge_count);
cmd->iov_size = 0;
return -1;
return -EINVAL;
}
iov_pa = megasas_sgl_get_addr(cmd, &cmd->frame->dcmd.sgl);
iov_size = megasas_sgl_get_len(cmd, &cmd->frame->dcmd.sgl);
pci_dma_sglist_init(&cmd->qsg, PCI_DEVICE(s), 1);
qemu_sglist_add(&cmd->qsg, iov_pa, iov_size);
cmd->iov_size = iov_size;
return cmd->iov_size;
return 0;
}
static void megasas_finish_dcmd(MegasasCmd *cmd, uint32_t iov_size)
@ -1559,19 +1559,20 @@ static const struct dcmd_cmd_tbl_t {
static int megasas_handle_dcmd(MegasasState *s, MegasasCmd *cmd)
{
int opcode, len;
int opcode;
int retval = 0;
size_t len;
const struct dcmd_cmd_tbl_t *cmdptr = dcmd_cmd_tbl;
opcode = le32_to_cpu(cmd->frame->dcmd.opcode);
trace_megasas_handle_dcmd(cmd->index, opcode);
len = megasas_map_dcmd(s, cmd);
if (len < 0) {
if (megasas_map_dcmd(s, cmd) < 0) {
return MFI_STAT_MEMORY_NOT_AVAILABLE;
}
while (cmdptr->opcode != -1 && cmdptr->opcode != opcode) {
cmdptr++;
}
len = cmd->iov_size;
if (cmdptr->opcode == -1) {
trace_megasas_dcmd_unhandled(cmd->index, opcode, len);
retval = megasas_dcmd_dummy(s, cmd);