From: Gustavo A. R. Silva <gustavo@embeddedor.com>
Date: Fri, 7 Jun 2019 18:53:14 +0000 (-0500)
Subject: remoteproc: Use struct_size() helper
X-Git-Tag: v5.3-rc1~55^2~8
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=77e5a44879c95ae0d453c71f132e8aa7b7883916;p=linux.git

remoteproc: Use struct_size() helper

One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct resource_table {
	...
        u32 offset[0];
} __packed;

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

So, replace the following form:

table->num * sizeof(table->offset[0]) + sizeof(struct resource_table)

with:

struct_size(table, offset, table->num)

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---

diff --git a/drivers/remoteproc/remoteproc_elf_loader.c b/drivers/remoteproc/remoteproc_elf_loader.c
index b17d72ec8603..a37d5cfc46e0 100644
--- a/drivers/remoteproc/remoteproc_elf_loader.c
+++ b/drivers/remoteproc/remoteproc_elf_loader.c
@@ -255,8 +255,7 @@ find_table(struct device *dev, struct elf32_hdr *ehdr, size_t fw_size)
 		}
 
 		/* make sure the offsets array isn't truncated */
-		if (table->num * sizeof(table->offset[0]) +
-				sizeof(struct resource_table) > size) {
+		if (struct_size(table, offset, table->num) > size) {
 			dev_err(dev, "resource table incomplete\n");
 			return NULL;
 		}