| Message ID | 86b404e1-4a75-4a35-a34e-e3054fa554c7@stanley.mountain (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | cxgb4: prevent potential integer overflow on 32bit | expand |
diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c index 80970a1738f8..034b85c42255 100644 --- a/drivers/infiniband/hw/cxgb4/device.c +++ b/drivers/infiniband/hw/cxgb4/device.c @@ -1114,8 +1114,10 @@ static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl, * The math here assumes sizeof cpl_pass_accept_req >= sizeof * cpl_rx_pkt. */ - skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) + - sizeof(struct rss_header) - pktshift, GFP_ATOMIC); + skb = alloc_skb(size_add(gl->tot_len, + sizeof(struct cpl_pass_accept_req) + + sizeof(struct rss_header)) - pktshift, + GFP_ATOMIC); if (unlikely(!skb)) return NULL;
The "gl->tot_len" variable is controlled by the user. It comes from process_responses(). On 32bit systems, the "gl->tot_len + sizeof(struct cpl_pass_accept_req) + sizeof(struct rss_header)" addition could have an integer wrapping bug. Use size_add() to prevent this. Fixes: a08943947873 ("crypto: chtls - Register chtls with net tls") Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> --- This is from static analysis. I've spent some time reviewing this code but I might be wrong. drivers/infiniband/hw/cxgb4/device.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)