linux-kernel - [PATCH net-next 1/4] net: ipa: fix init header command validation

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Message-Id: <20210319042923.1584593-2-elder@linaro.org>
Date:   Thu, 18 Mar 2021 23:29:20 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     bjorn.andersson@...aro.org, evgreen@...omium.org,
        cpratapa@...eaurora.org, elder@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 1/4] net: ipa: fix init header command validation

We use ipa_cmd_header_valid() to ensure certain values we will
program into hardware are within range, well in advance of when we
actually program them.  This way we avoid having to check for errors
when we actually program the hardware.

Unfortunately the dev_err() call for a bad offset value does not
supply the arguments to match the format specifiers properly.
Fix this.

There was also supposed to be a check to ensure the size to be
programmed fits in the field that holds it.  Add this missing check.

Rearrange the way we ensure the header table fits in overall IPA
memory range.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_cmd.c | 49 +++++++++++++++++++++++++--------------
 1 file changed, 32 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c
index 35e35852c25c5..b40f031a905a7 100644
--- a/drivers/net/ipa/ipa_cmd.c
+++ b/drivers/net/ipa/ipa_cmd.c
@@ -175,21 +175,23 @@ bool ipa_cmd_table_valid(struct ipa *ipa, const struct ipa_mem *mem,
 			    : field_max(IP_FLTRT_FLAGS_NHASH_ADDR_FMASK);
 	if (mem->offset > offset_max ||
 	    ipa->mem_offset > offset_max - mem->offset) {
-		dev_err(dev, "IPv%c %s%s table region offset too large "
-			      "(0x%04x + 0x%04x > 0x%04x)\n",
-			      ipv6 ? '6' : '4', hashed ? "hashed " : "",
-			      route ? "route" : "filter",
-			      ipa->mem_offset, mem->offset, offset_max);
+		dev_err(dev, "IPv%c %s%s table region offset too large\n",
+			ipv6 ? '6' : '4', hashed ? "hashed " : "",
+			route ? "route" : "filter");
+		dev_err(dev, "    (0x%04x + 0x%04x > 0x%04x)\n",
+			ipa->mem_offset, mem->offset, offset_max);
+
 		return false;
 	}
 
 	if (mem->offset > ipa->mem_size ||
 	    mem->size > ipa->mem_size - mem->offset) {
-		dev_err(dev, "IPv%c %s%s table region out of range "
-			      "(0x%04x + 0x%04x > 0x%04x)\n",
-			      ipv6 ? '6' : '4', hashed ? "hashed " : "",
-			      route ? "route" : "filter",
-			      mem->offset, mem->size, ipa->mem_size);
+		dev_err(dev, "IPv%c %s%s table region out of range\n",
+			ipv6 ? '6' : '4', hashed ? "hashed " : "",
+			route ? "route" : "filter");
+		dev_err(dev, "    (0x%04x + 0x%04x > 0x%04x)\n",
+			mem->offset, mem->size, ipa->mem_size);
+
 		return false;
 	}
 
@@ -205,22 +207,35 @@ static bool ipa_cmd_header_valid(struct ipa *ipa)
 	u32 size_max;
 	u32 size;
 
+	/* In ipa_cmd_hdr_init_local_add() we record the offset and size
+	 * of the header table memory area.  Make sure the offset and size
+	 * fit in the fields that need to hold them, and that the entire
+	 * range is within the overall IPA memory range.
+	 */
 	offset_max = field_max(HDR_INIT_LOCAL_FLAGS_HDR_ADDR_FMASK);
 	if (mem->offset > offset_max ||
 	    ipa->mem_offset > offset_max - mem->offset) {
-		dev_err(dev, "header table region offset too large "
-			      "(0x%04x + 0x%04x > 0x%04x)\n",
-			      ipa->mem_offset + mem->offset, offset_max);
+		dev_err(dev, "header table region offset too large\n");
+		dev_err(dev, "    (0x%04x + 0x%04x > 0x%04x)\n",
+			ipa->mem_offset, mem->offset, offset_max);
+
 		return false;
 	}
 
 	size_max = field_max(HDR_INIT_LOCAL_FLAGS_TABLE_SIZE_FMASK);
 	size = ipa->mem[IPA_MEM_MODEM_HEADER].size;
 	size += ipa->mem[IPA_MEM_AP_HEADER].size;
-	if (mem->offset > ipa->mem_size || size > ipa->mem_size - mem->offset) {
-		dev_err(dev, "header table region out of range "
-			      "(0x%04x + 0x%04x > 0x%04x)\n",
-			      mem->offset, size, ipa->mem_size);
+	if (size > size_max) {
+		dev_err(dev, "header table region too large\n");
+		dev_err(dev, "    (0x%04x > 0x%04x)\n", size, size_max);
+
+		return false;
+	}
+	if (size > ipa->mem_size || mem->offset > ipa->mem_size - size) {
+		dev_err(dev, "header table region out of range\n");
+		dev_err(dev, "    (0x%04x + 0x%04x > 0x%04x)\n",
+			mem->offset, size, ipa->mem_size);
+
 		return false;
 	}
 
-- 
2.27.0