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| author |   Ben Hutchings <ben@decadent.org.uk> | 2015-11-01 16:22:53 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-11-02 16:25:00 -0500 |
| commit | 4ab42d78e37a294ac7bc56901d563c642e03c4ae (patch) | |
| tree | eed185aafd345a302f05711c3e6d5d80fca7c3f9 /drivers/net/ppp/ppp_generic.c | |
| parent | isdn_ppp: Add checks for allocation failure in isdn_ppp_open() (diff) | |
| download | linux-dev-4ab42d78e37a294ac7bc56901d563c642e03c4ae.tar.xz linux-dev-4ab42d78e37a294ac7bc56901d563c642e03c4ae.zip | |
ppp, slip: Validate VJ compression slot parameters completely
Currently slhc_init() treats out-of-range values of rslots and tslots
as equivalent to 0, except that if tslots is too large it will
dereference a null pointer (CVE-2015-7799).
Add a range-check at the top of the function and make it return an
ERR_PTR() on error instead of NULL. Change the callers accordingly.
Compile-tested only.
Reported-by: 郭永刚 <guoyonggang@360.cn>
References: http://article.gmane.org/gmane.comp.security.oss.general/17908
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/ppp/ppp_generic.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c index ed00446759b2..9a863c6a6a33 100644 --- a/drivers/net/ppp/ppp_generic.c +++ b/drivers/net/ppp/ppp_generic.c @@ -721,10 +721,8 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) val &= 0xffff; } vj = slhc_init(val2+1, val+1); - if (!vj) { - netdev_err(ppp->dev, - "PPP: no memory (VJ compressor)\n"); - err = -ENOMEM; + if (IS_ERR(vj)) { + err = PTR_ERR(vj); break; } ppp_lock(ppp); |