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Staging: bcm: Fix an integer overflow in IOCTL_BCM_NVM_READ/WRITE

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Variables stNVMReadWrite.uioffset and stNVMReadWrite.uiNumBytes
are chosen from userspace and can be very high. The sum of
these two digits would result in a small number. Therefore,
this patch verifies a negative number was not entered, and
reorganizes the equation to remove the integer overflow.

Signed-off-by: Kevin McKinney <klmckinney1@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kevin McKinney 2011-12-20 10:41:13 -05:00 committed by Greg Kroah-Hartman
parent 3c92e38dc4
commit b71dbbcfaa
1 changed files with 3 additions and 1 deletions
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4
drivers/staging/bcm/Bcmchar.c
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@ -1302,8 +1302,10 @@ static long bcm_char_ioctl(struct file *filp, UINT cmd, ULONG arg)
/*
* Deny the access if the offset crosses the cal area limit.
*/
if (stNVMReadWrite.uiNumBytes > Adapter->uiNVMDSDSize)
return STATUS_FAILURE;
if ((stNVMReadWrite.uiOffset + stNVMReadWrite.uiNumBytes) > Adapter->uiNVMDSDSize) {
if (stNVMReadWrite.uiOffset > Adapter->uiNVMDSDSize - stNVMReadWrite.uiNumBytes) {
/* BCM_DEBUG_PRINT(Adapter,DBG_TYPE_PRINTK, 0, 0,"Can't allow access beyond NVM Size: 0x%x 0x%x\n", stNVMReadWrite.uiOffset, stNVMReadWrite.uiNumBytes); */
return STATUS_FAILURE;
}