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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexander Zubkov , Simon Horman , Michael Werner , Casey Leedom , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, Jason Gunthorpe Subject: [PATCH net] chelsio/chtls: prevent potential integer overflow on 32bit Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline X-Mailer: git-send-email haha only kidding Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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") Cc: stable@vger.kernel.org Signed-off-by: Dan Carpenter Reviewed-by: Simon Horman --- I fixed a similar bug earlier: https://lore.kernel.org/all/86b404e1-4a75-4a35-a34e-e3054fa554c7@stanley.mo= untain .../net/ethernet/chelsio/inline_crypto/chtls/chtls_main.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_main.c = b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_main.c index 96fd31d75dfd..daa1ebaef511 100644 --- a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_main.c +++ b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_main.c @@ -346,8 +346,9 @@ static struct sk_buff *copy_gl_to_skb_pkt(const struct = pkt_gl *gl, * driver. Once driver synthesizes cpl_pass_accept_req the skb will go * through the regular cpl_pass_accept_req processing in TOM. */ - skb =3D alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) - - pktshift, GFP_ATOMIC); + skb =3D alloc_skb(size_add(gl->tot_len, + sizeof(struct cpl_pass_accept_req)) - + pktshift, GFP_ATOMIC); if (unlikely(!skb)) return NULL; __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) --=20 2.45.2