Commit d3df4de7 authored Apr 16, 2015 by Quentin Casasnovas Committed by Rusty Russell Apr 22, 2015

modpost: fix inverted logic in is_extable_fault_address().



As Guenter pointed out, we want to assert that extable_entry_size has been
discovered and not the other way around.  Moreover, this sanity check is
only valid when we're not dealing with the first relocation in __ex_table,
since we have not discovered the extable entry size at that point.

This was leading to a divide-by-zero on some architectures and make the
build fail.

Signed-off-by: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
CC: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

parent 6c730bfc

scripts/mod/modpost.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -1529,7 +1529,12 @@ static void find_extable_entry_size(const char* const sec, const Elf_Rela* r,
		}
		static inline bool is_extable_fault_address(Elf_Rela *r)
		{
		if (!extable_entry_size == 0)
		/*
		* extable_entry_size is only discovered after we've handled the
		* _second_ relocation in __ex_table, so only abort when we're not
		* handling the first reloc and extable_entry_size is zero.
		*/
		if (r->r_offset && extable_entry_size == 0)
		fatal("extable_entry size hasn't been discovered!\n");

		return ((r->r_offset == 0) \|\|