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libnvdimm: fix integer overflow static analysis warning

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Dan reports:
    The patch 62232e45f4: "libnvdimm: control (ioctl) messages for
    nvdimm_bus and nvdimm devices" from Jun 8, 2015, leads to the
    following static checker warning:

            drivers/nvdimm/bus.c:1018 __nd_ioctl()
            warn: integer overflows 'buf_len'

    From a casual review, this seems like it might be a real bug.  On
    the first iteration we load some data into in_env[].  On the second
    iteration we read a use controlled "in_size" from nd_cmd_in_size().
    It can go up to UINT_MAX - 1.  A high number means we will fill the
    whole in_env[] buffer.  But we potentially keep looping and adding
    more to in_len so now it can be any value.

    It simple enough to change, but it feels weird that we keep looping
    even though in_env is totally full.  Shouldn't we just return an
    error if we don't have space for desc->in_num.

We keep looping because the size of the total input is allowed to be
bigger than the 'envelope' which is a subset of the payload that tells
us how much data to expect. For safety explicitly check that buf_len
does not overflow which is what the checker flagged.

Cc: <stable@vger.kernel.org>
Fixes: 62232e45f4: "libnvdimm: control (ioctl) messages for nvdimm_bus..."
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2017-08-31 15:41:55 -07:00
parent 5deb67f77a
commit 58738c495e
1 changed files with 9 additions and 8 deletions
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17
drivers/nvdimm/bus.c
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@ -911,19 +911,20 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
int read_only, unsigned int ioctl_cmd, unsigned long arg)
{
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
size_t buf_len = 0, in_len = 0, out_len = 0;
static char out_env[ND_CMD_MAX_ENVELOPE];
static char in_env[ND_CMD_MAX_ENVELOPE];
const struct nd_cmd_desc *desc = NULL;
unsigned int cmd = _IOC_NR(ioctl_cmd);
unsigned int func = cmd;
void __user *p = (void __user *) arg;
struct device *dev = &nvdimm_bus->dev;
struct nd_cmd_pkg pkg;
void __user *p = (void __user *) arg;
const char *cmd_name, *dimm_name;
u32 in_len = 0, out_len = 0;
unsigned int func = cmd;
unsigned long cmd_mask;
void *buf;
struct nd_cmd_pkg pkg;
int rc, i, cmd_rc;
u64 buf_len = 0;
void *buf;
if (nvdimm) {
desc = nd_cmd_dimm_desc(cmd);
@ -983,7 +984,7 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
if (cmd == ND_CMD_CALL) {
func = pkg.nd_command;
dev_dbg(dev, "%s:%s, idx: %llu, in: %zu, out: %zu, len %zu\n",
dev_dbg(dev, "%s:%s, idx: %llu, in: %u, out: %u, len %llu\n",
__func__, dimm_name, pkg.nd_command,
in_len, out_len, buf_len);
@ -1013,9 +1014,9 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
out_len += out_size;
}
buf_len = out_len + in_len;
buf_len = (u64) out_len + (u64) in_len;
if (buf_len > ND_IOCTL_MAX_BUFLEN) {
dev_dbg(dev, "%s:%s cmd: %s buf_len: %zu > %d\n", __func__,
dev_dbg(dev, "%s:%s cmd: %s buf_len: %llu > %d\n", __func__,
dimm_name, cmd_name, buf_len,
ND_IOCTL_MAX_BUFLEN);
return -EINVAL;