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author | Kevin McKinney <klmckinney1@gmail.com> | 2011-09-18 22:34:47 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-09-19 17:46:17 (GMT) |
commit | e228b7426e65df0f2e93c783c2c89baabe318b9b (patch) | |
tree | 0ebdfdcd307d57ae2f5137e70e7192cfbb3dad42 | |
parent | 5ac5bd8754b3dabcf4aea7b5f4a28a1d8494a1b0 (diff) | |
download | linux-e228b7426e65df0f2e93c783c2c89baabe318b9b.tar.xz |
Staging: bcm: Add size maximum size restrictions for IOCTL_IDLE_REQ
In the first alteration, the MAX_CNTL_PKT_SIZE is the
maximum size of the control packet in ->Adapter->txctlpacket[]
which is defined in InitAdapter(). This caps the size of
kmalloc memory allocation. In the second change, this max
cap fixes a potential memory corruption bug when subsequent
memset and memcpy calls are invoked.
Signed-off-by: Kevin McKinney <klmckinney1@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r-- | drivers/staging/bcm/Bcmchar.c | 3 | ||||
-rw-r--r-- | drivers/staging/bcm/Misc.c | 4 |
2 files changed, 7 insertions, 0 deletions
diff --git a/drivers/staging/bcm/Bcmchar.c b/drivers/staging/bcm/Bcmchar.c index 1905a83..4c43353 100644 --- a/drivers/staging/bcm/Bcmchar.c +++ b/drivers/staging/bcm/Bcmchar.c @@ -690,6 +690,9 @@ static long bcm_char_ioctl(struct file *filp, UINT cmd, ULONG arg) if (IoBuffer.InputLength < sizeof(struct link_request)) return -EINVAL; + if (IoBuffer.InputLength > MAX_CNTL_PKT_SIZE) + return -EINVAL; + pvBuffer = kmalloc(IoBuffer.InputLength, GFP_KERNEL); if (!pvBuffer) return -ENOMEM; diff --git a/drivers/staging/bcm/Misc.c b/drivers/staging/bcm/Misc.c index c5b3a36..9da9408 100644 --- a/drivers/staging/bcm/Misc.c +++ b/drivers/staging/bcm/Misc.c @@ -421,6 +421,10 @@ INT CopyBufferToControlPacket(PMINI_ADAPTER Adapter,/**<Logical Adapter*/ pLeader->PLength = pktlen; } } + + if (pktlen + LEADER_SIZE > MAX_CNTL_PKT_SIZE) + return -EINVAL; + memset(ctrl_buff, 0, pktlen+LEADER_SIZE); BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "Copying the Control Packet Buffer with length=%d\n", pLeader->PLength); *(PLEADER)ctrl_buff=*pLeader; |