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| author | David Rientjes <rientjes@google.com> | 2018-02-21 14:45:32 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-30 07:49:00 +0200 |
| commit | e284495e2f42eeb1e5777264105cf236cdf893ed (patch) | |
| tree | f83c448b4dec6644555219eeec1d55fa7487baef | |
| parent | e163691fa8e8403d1637690c7ef43c0a423deb25 (diff) | |
| download | linux-stable-e284495e2f42eeb1e5777264105cf236cdf893ed.tar.gz linux-stable-e284495e2f42eeb1e5777264105cf236cdf893ed.tar.bz2 linux-stable-e284495e2f42eeb1e5777264105cf236cdf893ed.zip | |
kernel/relay.c: limit kmalloc size to KMALLOC_MAX_SIZE
[ Upstream commit 88913bd8ea2a75d7e460a4bed5f75e1c32660d7e ]
chan->n_subbufs is set by the user and relay_create_buf() does a kmalloc()
of chan->n_subbufs * sizeof(size_t *).
kmalloc_slab() will generate a warning when this fails if
chan->subbufs * sizeof(size_t *) > KMALLOC_MAX_SIZE.
Limit chan->n_subbufs to the maximum allowed kmalloc() size.
Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1802061216100.122576@chino.kir.corp.google.com
Fixes: f6302f1bcd75 ("relay: prevent integer overflow in relay_open()")
Signed-off-by: David Rientjes <rientjes@google.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/relay.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/relay.c b/kernel/relay.c index 0b4570cfacae..f6d5f08bdfaa 100644 --- a/kernel/relay.c +++ b/kernel/relay.c @@ -163,7 +163,7 @@ static struct rchan_buf *relay_create_buf(struct rchan *chan) { struct rchan_buf *buf; - if (chan->n_subbufs > UINT_MAX / sizeof(size_t *)) + if (chan->n_subbufs > KMALLOC_MAX_SIZE / sizeof(size_t *)) return NULL; buf = kzalloc(sizeof(struct rchan_buf), GFP_KERNEL); |