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| author | Roland Dreier <rolandd@cisco.com> | 2008-06-10 12:29:49 -0700 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2008-06-10 12:29:49 -0700 |
| commit | 24797a344293601f14f49e2d259c3ca447c4f802 (patch) | |
| tree | cab0bcd13e61696ddda726ded59bd5428f72bd56 /drivers/infiniband | |
| parent | 5e70b7f3c24468bb1635b295945edb48ecd9656a (diff) | |
| download | talos-op-linux-24797a344293601f14f49e2d259c3ca447c4f802.tar.gz talos-op-linux-24797a344293601f14f49e2d259c3ca447c4f802.zip | |
RDMA/nes: Fix off-by-one in nes_reg_user_mr() error path
nes_reg_user_mr() should fail if page_count becomes >= 1024 * 512
rather than just testing for strict >, because page_count is
essentially used as an index into an array with 1024 * 512 entries, so
allowing the loop to continue with page_count == 1024 * 512 means that
memory after the end of the array is corrupted. This leads to a crash
triggerable by a userspace application that requests registration of a
too-big region.
Also get rid of the call to pci_free_consistent() here to avoid
corrupting state with a double free, since the same memory will be
freed in the code jumped to at reg_user_mr_err.
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/hw/nes/nes_verbs.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/infiniband/hw/nes/nes_verbs.c b/drivers/infiniband/hw/nes/nes_verbs.c index 99b3c4ae86eb..d617da9bd351 100644 --- a/drivers/infiniband/hw/nes/nes_verbs.c +++ b/drivers/infiniband/hw/nes/nes_verbs.c @@ -2456,10 +2456,8 @@ static struct ib_mr *nes_reg_user_mr(struct ib_pd *pd, u64 start, u64 length, if ((page_count!=0)&&(page_count<<12)-(region->offset&(4096-1))>=region->length) goto enough_pages; if ((page_count&0x01FF) == 0) { - if (page_count>(1024*512)) { + if (page_count >= 1024 * 512) { ib_umem_release(region); - pci_free_consistent(nesdev->pcidev, 4096, vpbl.pbl_vbase, - vpbl.pbl_pbase); nes_free_resource(nesadapter, nesadapter->allocated_mrs, stag_index); kfree(nesmr); |
