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Date: Thu, 31 Jan 2013 11:16:46 +0300 From: Dan Carpenter <dan.carpenter@...cle.com> To: Lauro Ramos Venancio <lauro.venancio@...nbossa.org> Cc: Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>, Samuel Ortiz <sameo@...ux.intel.com>, "David S. Miller" <davem@...emloft.net>, "John W. Linville" <linville@...driver.com>, Thierry Escande <thierry.escande@...ux.intel.com>, Szymon Janc <szymon.janc@...to.com>, linux-wireless@...r.kernel.org, linux-nfc@...1.01.org, netdev@...r.kernel.org, kernel-janitors@...r.kernel.org Subject: [patch] NFC: llcp: integer underflow in nfc_llcp_set_remote_gb() If gb_len is less than 3 it would cause an integer underflow and possibly memory corruption in nfc_llcp_parse_gb_tlv(). I removed the old test for gb_len == 0. I also removed the test for ->remote_gb == NULL. It's not possible for ->remote_gb to be NULL and we have already dereferenced ->remote_gb_len so it's too late to test. The old test return -ENODEV but my test returns -EINVAL. Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com> diff --git a/net/nfc/llcp/llcp.c b/net/nfc/llcp/llcp.c index 85bc75c..746f5a2 100644 --- a/net/nfc/llcp/llcp.c +++ b/net/nfc/llcp/llcp.c @@ -549,14 +549,13 @@ int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len) pr_err("No LLCP device\n"); return -ENODEV; } + if (gb_len < 3) + return -EINVAL; memset(local->remote_gb, 0, NFC_MAX_GT_LEN); memcpy(local->remote_gb, gb, gb_len); local->remote_gb_len = gb_len; - if (local->remote_gb == NULL || local->remote_gb_len == 0) - return -ENODEV; - if (memcmp(local->remote_gb, llcp_magic, 3)) { pr_err("MAC does not support LLCP\n"); return -EINVAL; -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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