When building with -Og gcc is unable to see that __libdw_dieabbrev () will initialize what the second argument points to when no error occurs as called by dwarf_child and dwarf_getattrs. Causing an possibly uninitialized error. Just initialize readp/die_addr to NULL, which is the value we would return if an error occurs anyway.
https://sourceware.org/bugzilla/show_bug.cgi?id=23914 Signed-off-by: Mark Wielaard <m...@klomp.org> --- libdw/ChangeLog | 5 +++++ libdw/dwarf_child.c | 2 +- libdw/dwarf_getattrs.c | 2 +- 3 files changed, 7 insertions(+), 2 deletions(-) diff --git a/libdw/ChangeLog b/libdw/ChangeLog index 7caa223..44405d7 100644 --- a/libdw/ChangeLog +++ b/libdw/ChangeLog @@ -1,3 +1,8 @@ +2018-10-23 Mark Wielaard <m...@klomp.org> + + * dwarf_child.c (__libdw_find_attr): Initialize readp to NULL. + * dwarf_getattrs.c (dwarf_getattrs): Initialize die_addr to NULL. + 2018-10-20 Mark Wielaard <m...@klomp.org> * libdw.map (ELFUTILS_0.175): New section. Add dwelf_elf_begin. diff --git a/libdw/dwarf_child.c b/libdw/dwarf_child.c index 9446b88..2e39d83 100644 --- a/libdw/dwarf_child.c +++ b/libdw/dwarf_child.c @@ -43,7 +43,7 @@ internal_function __libdw_find_attr (Dwarf_Die *die, unsigned int search_name, unsigned int *codep, unsigned int *formp) { - const unsigned char *readp; + const unsigned char *readp = NULL; /* Find the abbreviation entry. */ Dwarf_Abbrev *abbrevp = __libdw_dieabbrev (die, &readp); diff --git a/libdw/dwarf_getattrs.c b/libdw/dwarf_getattrs.c index 50faf98..4ac16b1 100644 --- a/libdw/dwarf_getattrs.c +++ b/libdw/dwarf_getattrs.c @@ -44,7 +44,7 @@ dwarf_getattrs (Dwarf_Die *die, int (*callback) (Dwarf_Attribute *, void *), if (unlikely (offset == 1)) return 1; - const unsigned char *die_addr; + const unsigned char *die_addr = NULL; /* Find the abbreviation entry. */ Dwarf_Abbrev *abbrevp = __libdw_dieabbrev (die, &die_addr); -- 1.8.3.1
