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| author | Xi Wang <xi.wang@gmail.com> | 2011-11-29 21:53:46 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-30 19:29:40 +0900 |
| commit | 201320435d017e8ebd449034547ef0518ec4d056 (patch) | |
| tree | 28d3e3eb643611d1ff8c240baf9f46d40d6a4693 | |
| parent | 2a58b19fd97c7368c03c027419a2aeb26313adad (diff) | |
| download | linux-201320435d017e8ebd449034547ef0518ec4d056.tar.gz linux-201320435d017e8ebd449034547ef0518ec4d056.tar.bz2 linux-201320435d017e8ebd449034547ef0518ec4d056.zip | |
staging: vt6656: integer overflows in private_ioctl()
There are two potential integer overflows in private_ioctl() if
userspace passes in a large sList.uItem / sNodeList.uItem. The
subsequent call to kmalloc() would allocate a small buffer, leading
to a memory corruption.
Reported-by: Dan Rosenberg <drosenberg@vsecurity.com>
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/staging/vt6656/ioctl.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/staging/vt6656/ioctl.c b/drivers/staging/vt6656/ioctl.c index 49390026dea3..1463d76895f0 100644 --- a/drivers/staging/vt6656/ioctl.c +++ b/drivers/staging/vt6656/ioctl.c @@ -295,6 +295,10 @@ int private_ioctl(PSDevice pDevice, struct ifreq *rq) result = -EFAULT; break; } + if (sList.uItem > (ULONG_MAX - sizeof(SBSSIDList)) / sizeof(SBSSIDItem)) { + result = -EINVAL; + break; + } pList = (PSBSSIDList)kmalloc(sizeof(SBSSIDList) + (sList.uItem * sizeof(SBSSIDItem)), (int)GFP_ATOMIC); if (pList == NULL) { result = -ENOMEM; @@ -557,6 +561,10 @@ int private_ioctl(PSDevice pDevice, struct ifreq *rq) result = -EFAULT; break; } + if (sNodeList.uItem > (ULONG_MAX - sizeof(SNodeList)) / sizeof(SNodeItem)) { + result = -ENOMEM; + break; + } pNodeList = (PSNodeList)kmalloc(sizeof(SNodeList) + (sNodeList.uItem * sizeof(SNodeItem)), (int)GFP_ATOMIC); if (pNodeList == NULL) { result = -ENOMEM; |