Commit f6302f1b authored by Dan Carpenter's avatar Dan Carpenter Committed by Jens Axboe

relay: prevent integer overflow in relay_open()

"subbuf_size" and "n_subbufs" come from the user and they need to be
capped to prevent an integer overflow.
Signed-off-by: default avatarDan Carpenter <>
Signed-off-by: default avatarJens Axboe <>
parent 306df071
......@@ -164,10 +164,14 @@ static void *relay_alloc_buf(struct rchan_buf *buf, size_t *size)
static struct rchan_buf *relay_create_buf(struct rchan *chan)
struct rchan_buf *buf = kzalloc(sizeof(struct rchan_buf), GFP_KERNEL);
if (!buf)
struct rchan_buf *buf;
if (chan->n_subbufs > UINT_MAX / sizeof(size_t *))
return NULL;
buf = kzalloc(sizeof(struct rchan_buf), GFP_KERNEL);
if (!buf)
return NULL;
buf->padding = kmalloc(chan->n_subbufs * sizeof(size_t *), GFP_KERNEL);
if (!buf->padding)
goto free_buf;
......@@ -574,6 +578,8 @@ struct rchan *relay_open(const char *base_filename,
if (!(subbuf_size && n_subbufs))
return NULL;
if (subbuf_size > UINT_MAX / n_subbufs)
return NULL;
chan = kzalloc(sizeof(struct rchan), GFP_KERNEL);
if (!chan)
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