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| author | Ralf Baechle <ralf@linux-mips.org> | 2009-08-17 18:05:32 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-08-17 18:05:32 -0700 |
| commit | c6ba973b8fa97422aab4204f7d79f1d413cde925 (patch) | |
| tree | 2fbd38ba11da09f18a6ba922c772b41364b03b20 /net | |
| parent | 68eac4602b9104cdaa6c18b3edd914cececa6a1e (diff) | |
| download | linux-c6ba973b8fa97422aab4204f7d79f1d413cde925.tar.gz linux-c6ba973b8fa97422aab4204f7d79f1d413cde925.tar.bz2 linux-c6ba973b8fa97422aab4204f7d79f1d413cde925.zip | |
NETROM: Fix use of static buffer
The static variable used by nr_call_to_digi might result in corruption if
multiple threads are trying to usee a node or neighbour via ioctl. Fixed
by having the caller pass a structure in. This is safe because nr_add_node
rsp. nr_add_neigh will allocate a permanent structure, if needed.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netrom/nr_route.c | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c index e943c16552a2..4eb1ac9a7679 100644 --- a/net/netrom/nr_route.c +++ b/net/netrom/nr_route.c @@ -630,23 +630,23 @@ out: return dev; } -static ax25_digi *nr_call_to_digi(int ndigis, ax25_address *digipeaters) +static ax25_digi *nr_call_to_digi(ax25_digi *digi, int ndigis, + ax25_address *digipeaters) { - static ax25_digi ax25_digi; int i; if (ndigis == 0) return NULL; for (i = 0; i < ndigis; i++) { - ax25_digi.calls[i] = digipeaters[i]; - ax25_digi.repeated[i] = 0; + digi->calls[i] = digipeaters[i]; + digi->repeated[i] = 0; } - ax25_digi.ndigi = ndigis; - ax25_digi.lastrepeat = -1; + digi->ndigi = ndigis; + digi->lastrepeat = -1; - return &ax25_digi; + return digi; } /* @@ -656,6 +656,7 @@ int nr_rt_ioctl(unsigned int cmd, void __user *arg) { struct nr_route_struct nr_route; struct net_device *dev; + ax25_digi digi; int ret; switch (cmd) { @@ -673,13 +674,15 @@ int nr_rt_ioctl(unsigned int cmd, void __user *arg) ret = nr_add_node(&nr_route.callsign, nr_route.mnemonic, &nr_route.neighbour, - nr_call_to_digi(nr_route.ndigis, nr_route.digipeaters), + nr_call_to_digi(&digi, nr_route.ndigis, + nr_route.digipeaters), dev, nr_route.quality, nr_route.obs_count); break; case NETROM_NEIGH: ret = nr_add_neigh(&nr_route.callsign, - nr_call_to_digi(nr_route.ndigis, nr_route.digipeaters), + nr_call_to_digi(&digi, nr_route.ndigis, + nr_route.digipeaters), dev, nr_route.quality); break; default: |