From cc6e53b9f305148bda275ade40c0e625d98da2f2 Mon Sep 17 00:00:00 2001 From: Mark Wielaard Date: Fri, 1 Mar 2024 17:05:16 +0100 Subject: [PATCH] libdw: Initialize tu_offset in __libdw_package_index MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit dwarf_cu_dwp_section_info.c: In function ‘__libdw_package_index’: dwarf_cu_dwp_section_info.c:306:25: error: ‘tu_offset’ may be used uninitialized [-Werror=maybe-uninitialized] 306 | tu_offset += tu_index->section_count * 4; | ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ dwarf_cu_dwp_section_info.c:268:28: note: ‘tu_offset’ was declared here 268 | const unsigned char *tu_offset; | ^~~~~~~~~ Which is the same issue we thought to have fixed by checking for tu_index != NULL but not all gcc versions seem able to see that. So just explicitly initialize tu_offset to NULL. We keep the older check, so the NULL pointer should never be used. * libdw/dwarf_cu_dwp_section_info.c (__libdw_package_index): Initialize tu_offset. Signed-off-by: Mark Wielaard --- libdw/dwarf_cu_dwp_section_info.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libdw/dwarf_cu_dwp_section_info.c b/libdw/dwarf_cu_dwp_section_info.c index 9fdc15bf..5a081f5a 100644 --- a/libdw/dwarf_cu_dwp_section_info.c +++ b/libdw/dwarf_cu_dwp_section_info.c @@ -265,7 +265,7 @@ __libdw_package_index (Dwarf *dbg, bool tu) const unsigned char *cu_offset = cu_index->section_offsets + cu_index->sections[DW_SECT_INFO - 1] * 4; uint32_t tu_count = 0; - const unsigned char *tu_offset; + const unsigned char *tu_offset = NULL; if (tu_index != NULL) { tu_count = tu_index->unit_count; -- 2.43.2