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| author | Dan Carpenter <dan.carpenter@linaro.org> | 2023-10-19 20:32:27 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-10-20 14:53:06 +0300 |
| commit | a41654c3ed1d7d6a2f7ae485f3e3c655b428f38f (patch) | |
| tree | a787c5a354d729d3c81d1578c94cf855cc214dba /drivers/net/ethernet/intel/ixgbe | |
| parent | 4690aea589e76e887a40195b35b6d19a838058eb (diff) | |
| download | linux-a41654c3ed1d7d6a2f7ae485f3e3c655b428f38f.tar.xz | |
ixgbe: fix end of loop test in ixgbe_set_vf_macvlan()
The list iterator in a list_for_each_entry() loop can never be NULL.
If the loop exits without hitting a break then the iterator points
to an offset off the list head and dereferencing it is an out of
bounds access.
Before we transitioned to using list_for_each_entry() loops, then
it was possible for "entry" to be NULL and the comments mention
this. I have updated the comments to match the new code.
Fixes: c1fec890458a ("ethernet/intel: Use list_for_each_entry() helper")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/intel/ixgbe')
| -rw-r--r-- | drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c index cd593f5719e1..9cfdfa8a4355 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c @@ -640,6 +640,7 @@ static int ixgbe_set_vf_macvlan(struct ixgbe_adapter *adapter, int vf, int index, unsigned char *mac_addr) { struct vf_macvlans *entry; + bool found = false; int retval = 0; if (index <= 1) { @@ -661,22 +662,22 @@ static int ixgbe_set_vf_macvlan(struct ixgbe_adapter *adapter, if (!index) return 0; - entry = NULL; - list_for_each_entry(entry, &adapter->vf_mvs.l, l) { - if (entry->free) + if (entry->free) { + found = true; break; + } } /* * If we traversed the entire list and didn't find a free entry - * then we're out of space on the RAR table. Also entry may - * be NULL because the original memory allocation for the list - * failed, which is not fatal but does mean we can't support - * VF requests for MACVLAN because we couldn't allocate - * memory for the list management required. + * then we're out of space on the RAR table. It's also possible + * for the &adapter->vf_mvs.l list to be empty because the original + * memory allocation for the list failed, which is not fatal but does + * mean we can't support VF requests for MACVLAN because we couldn't + * allocate memory for the list management required. */ - if (!entry || !entry->free) + if (!found) return -ENOSPC; retval = ixgbe_add_mac_filter(adapter, mac_addr, vf); |