[coreboot-gerrit] Change in ...coreboot[master]: util/cbfstool: Use 64 bit integers in multiplications

[Jacob Garber (Code Review)]

Jacob Garber has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/33986

Change subject: util/cbfstool: Use 64 bit integers in multiplications
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util/cbfstool: Use 64 bit integers in multiplications

The operands in these multiplications are 16 bit integers, which are
implicitly converted to signed int's before doing the multiplication.
To prevent possible overflow and other sign troubles, cast them to the
appropriate 64 bit types they are stored in before multiplying.

Change-Id: I5391221d46d620d0e5bd629e2f9680be7a53342e
Signed-off-by: Jacob Garber 
Found-by: Coverity CID 12297{03,04,05,06,07,08,09,10}
---
M util/cbfstool/elfheaders.c
1 file changed, 6 insertions(+), 6 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/86/33986/1

diff --git a/util/cbfstool/elfheaders.c b/util/cbfstool/elfheaders.c
index 8da54d0..1c43fdb 100644
--- a/util/cbfstool/elfheaders.c
+++ b/util/cbfstool/elfheaders.c
@@ -262,7 +262,7 @@
     * per the ELF spec, You'd be surprised how many ELF
     * readers miss this little detail.
     */
-	buffer_splice(&b, in, ehdr->e_phoff, ehdr->e_phentsize * ehdr->e_phnum);
+	buffer_splice(&b, in, ehdr->e_phoff, (size_t)ehdr->e_phentsize * ehdr->e_phnum);
    if (check_size(in, ehdr->e_phoff, buffer_size(&b), "program headers"))
    	return -1;

@@ -304,7 +304,7 @@
     * per the ELF spec, You'd be surprised how many ELF
     * readers miss this little detail.
     */
-	buffer_splice(&b, in, ehdr->e_shoff, ehdr->e_shentsize * ehdr->e_shnum);
+	buffer_splice(&b, in, ehdr->e_shoff, (size_t)ehdr->e_shentsize * ehdr->e_shnum);
    if (check_size(in, ehdr->e_shoff, buffer_size(&b), "section headers"))
    	return -1;

@@ -1180,8 +1180,8 @@
    ew->ehdr.e_shnum = ew->num_secs;
    metadata_size = 0;
    metadata_size += ew->ehdr.e_ehsize;
-	metadata_size += ew->ehdr.e_shnum * ew->ehdr.e_shentsize;
-	metadata_size += ew->ehdr.e_phnum * ew->ehdr.e_phentsize;
+	metadata_size += (Elf64_Xword)ew->ehdr.e_shnum * ew->ehdr.e_shentsize;
+	metadata_size += (Elf64_Xword)ew->ehdr.e_phnum * ew->ehdr.e_phentsize;
    shstroffset = metadata_size;
    /* Align up section header string size and metadata size to 4KiB */
    metadata_size = ALIGN(metadata_size + shstrlen, 4096);
@@ -1200,11 +1200,11 @@
     */
    ew->ehdr.e_shoff = ew->ehdr.e_ehsize;
    ew->ehdr.e_phoff = ew->ehdr.e_shoff +
-	                   ew->ehdr.e_shnum * ew->ehdr.e_shentsize;
+			   (Elf64_Off)ew->ehdr.e_shnum * ew->ehdr.e_shentsize;

buffer_splice(&metadata, out, 0, metadata_size);
    buffer_splice(&phdrs, out, ew->ehdr.e_phoff,
-	              ew->ehdr.e_phnum * ew->ehdr.e_phentsize);
+		      (size_t)ew->ehdr.e_phnum * ew->ehdr.e_phentsize);
    buffer_splice(&data, out, metadata_size, program_size);
    /* Set up the section header string table contents. */
    strtab = &ew->shstrtab_sec->content;