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[Bug middle-end/48558] -Warray-bounds fails to detect the out of bound array access
- From: "hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 11 Apr 2011 19:09:56 +0000
- Subject: [Bug middle-end/48558] -Warray-bounds fails to detect the out of bound array access
- Auto-submitted: auto-generated
- References: <bug-48558-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48558
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2011-04-11 19:09:54 UTC ---
A simple change from
return &elf_howto_table[R_386_IRELATIVE];
to
return elf_howto_table[R_386_IRELATIVE];
makes GCC to warn:
[hjl@gnu-6 bfd]$ cat x.c
enum bfd_reloc_code_real {
BFD_RELOC_386_IRELATIVE
};
typedef enum bfd_reloc_code_real bfd_reloc_code_real_type;
typedef const struct reloc_howto_struct reloc_howto_type;
struct reloc_howto_struct
{
unsigned int type;
};
enum elf_i386_reloc_type {
R_386_IRELATIVE = 42,
};
static reloc_howto_type elf_howto_table[]=
{
{
(unsigned) R_386_IRELATIVE
}
};
reloc_howto_type
elf_i386_reloc_type_lookup (bfd_reloc_code_real_type code)
{
switch (code)
{
case BFD_RELOC_386_IRELATIVE:
return elf_howto_table[R_386_IRELATIVE];
default:
break;
}
return elf_howto_table[0];
}
[hjl@gnu-6 bfd]$ /usr/gcc-4.7.0-x32/bin/gcc -O3 -S -Wall x.c -Warray-bounds
x.c: In function âelf_i386_reloc_type_lookupâ:
x.c:25:29: warning: array subscript is above array bounds [-Warray-bounds]
[hjl@gnu-6 bfd]$