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pvrdma: check number of pages when creating rings

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When creating CQ/QP rings, an object can have up to
PVRDMA_MAX_FAST_REG_PAGES 8 pages. Check 'npages' parameter
to avoid excessive memory allocation or a null dereference.

Reported-by: Li Qiang <liq3ea@163.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
This commit is contained in:
Prasad J Pandit 2018-12-13 01:00:36 +05:30 committed by Marcel Apfelbaum
parent 2aa86456fb
commit 2c858ce5da
1 changed files with 11 additions and 0 deletions
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11
hw/rdma/vmw/pvrdma_cmd.c
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@ -259,6 +259,11 @@ static int create_cq_ring(PCIDevice *pci_dev , PvrdmaRing **ring,
int rc = -EINVAL;
char ring_name[MAX_RING_NAME_SZ];
if (!nchunks || nchunks > PVRDMA_MAX_FAST_REG_PAGES) {
pr_dbg("invalid nchunks: %d\n", nchunks);
return rc;
}
pr_dbg("pdir_dma=0x%llx\n", (long long unsigned int)pdir_dma);
dir = rdma_pci_dma_map(pci_dev, pdir_dma, TARGET_PAGE_SIZE);
if (!dir) {
@ -372,6 +377,12 @@ static int create_qp_rings(PCIDevice *pci_dev, uint64_t pdir_dma,
char ring_name[MAX_RING_NAME_SZ];
uint32_t wqe_sz;
if (!spages || spages > PVRDMA_MAX_FAST_REG_PAGES
|| !rpages || rpages > PVRDMA_MAX_FAST_REG_PAGES) {
pr_dbg("invalid pages: %d, %d\n", spages, rpages);
return rc;
}
pr_dbg("pdir_dma=0x%llx\n", (long long unsigned int)pdir_dma);
dir = rdma_pci_dma_map(pci_dev, pdir_dma, TARGET_PAGE_SIZE);
if (!dir) {