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| author | Alan Cox <alan@linux.intel.com> | 2012-07-30 14:41:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-30 17:25:17 -0700 |
| commit | 261eba73353edd48b0c0cb7aad59553dfc712ebc (patch) | |
| tree | 0bc64028f987e7777ed5002f0b4debf4422c28ad | |
| parent | 40251b8eb46e48c011939a3ddf056fe13a223319 (diff) | |
| download | lwn-261eba73353edd48b0c0cb7aad59553dfc712ebc.tar.gz lwn-261eba73353edd48b0c0cb7aad59553dfc712ebc.zip | |
drivers/message/i2o/i2o_config.c: bound allocation
Fix a case where users can try to allocate arbitarily large amounts of
memory. 64K is overkill for a config request so apply an upper bound.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/message/i2o/i2o_config.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/message/i2o/i2o_config.c b/drivers/message/i2o/i2o_config.c index 098de2b35784..9a49c243a6ac 100644 --- a/drivers/message/i2o/i2o_config.c +++ b/drivers/message/i2o/i2o_config.c @@ -188,6 +188,13 @@ static int i2o_cfg_parms(unsigned long arg, unsigned int type) if (!dev) return -ENXIO; + /* + * Stop users being able to try and allocate arbitary amounts + * of DMA space. 64K is way more than sufficient for this. + */ + if (kcmd.oplen > 65536) + return -EMSGSIZE; + ops = memdup_user(kcmd.opbuf, kcmd.oplen); if (IS_ERR(ops)) return PTR_ERR(ops); |