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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2014-12-30 02:48:09 +0200 |
|---|---|---|
| committer | Eric Van Hensbergen <ericvh@gmail.com> | 2015-03-20 07:34:42 -0700 |
| commit | 6250a8badb311953a49bedb16ed17eb59d21c03a (patch) | |
| tree | 53432ea0f158736b5a1f839935098cfba577d2c4 /net/9p | |
| parent | b642f7269bd40ae9abe9cff01581b2eb5e2c2287 (diff) | |
| download | lwn-6250a8badb311953a49bedb16ed17eb59d21c03a.tar.gz lwn-6250a8badb311953a49bedb16ed17eb59d21c03a.zip | |
9p: use unsigned integers for nwqid/count
As specification says, all integers in messages are unsigned. Let's fix
behaviour of p9pdu_vreadf()/p9pdu_vwritef() accordingly.
Fix for p9pdu_vreadf() is critical. If server replies with Rwalk, where
nwqid > SHRT_MAX, the value will be interpreted as negative. kmalloc, in
its order, will cast the value to (very big) size_t.
It should never happen in normal situation: we never submit Twalk with
nwname > 16, but malicious or broken server can still produce
problematic Rwalk.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'net/9p')
| -rw-r--r-- | net/9p/protocol.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/9p/protocol.c b/net/9p/protocol.c index ab9127ec5b7a..305e4789f2cc 100644 --- a/net/9p/protocol.c +++ b/net/9p/protocol.c @@ -273,7 +273,7 @@ p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, } break; case 'R':{ - int16_t *nwqid = va_arg(ap, int16_t *); + uint16_t *nwqid = va_arg(ap, uint16_t *); struct p9_qid **wqids = va_arg(ap, struct p9_qid **); @@ -448,7 +448,7 @@ p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, } break; case 'U':{ - int32_t count = va_arg(ap, int32_t); + uint32_t count = va_arg(ap, uint32_t); const char __user *udata = va_arg(ap, const void __user *); errcode = p9pdu_writef(pdu, proto_version, "d", @@ -479,7 +479,7 @@ p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, } break; case 'R':{ - int16_t nwqid = va_arg(ap, int); + uint16_t nwqid = va_arg(ap, int); struct p9_qid *wqids = va_arg(ap, struct p9_qid *); |