From 726bd37d6c5d5013d34023044ed7cbbb01317978 Mon Sep 17 00:00:00 2001 From: Alan Modra Date: Sat, 1 Dec 2018 21:15:03 +1030 Subject: [PATCH] PR23945, NULL pointer dereference in readelf.c:slurp_hppa_unwind_table PR 23945 * readelf.c (slurp_ia64_unwind_table): Don't call elf_ia64_reloc_type needlessly. (slurp_hppa_unwind_table): Use same range checks and error messages as slurp_ia64_unwind_table. --- binutils/ChangeLog | 8 ++++++++ binutils/readelf.c | 22 +++++++++++++++++----- 2 files changed, 25 insertions(+), 5 deletions(-) diff --git a/binutils/ChangeLog b/binutils/ChangeLog index ea86649a240..ccaa9c9a117 100644 --- a/binutils/ChangeLog +++ b/binutils/ChangeLog @@ -1,3 +1,11 @@ +2018-12-01 Alan Modra + + PR 23945 + * readelf.c (slurp_ia64_unwind_table): Don't call elf_ia64_reloc_type + needlessly. + (slurp_hppa_unwind_table): Use same range checks and error messages + as slurp_ia64_unwind_table. + 2018-11-29 Nick Clifton PR 23931 diff --git a/binutils/readelf.c b/binutils/readelf.c index afb039f7b79..9eb5931fe3a 100644 --- a/binutils/readelf.c +++ b/binutils/readelf.c @@ -7597,14 +7597,14 @@ slurp_ia64_unwind_table (Filedata * filedata, for (rp = rela; rp < rela + nrelas; ++rp) { - relname = elf_ia64_reloc_type (get_reloc_type (filedata, rp->r_info)); + unsigned int r_type = get_reloc_type (filedata, rp->r_info); + relname = elf_ia64_reloc_type (r_type); sym = aux->symtab + get_reloc_symindex (rp->r_info); /* PR 17531: file: 9fa67536. */ if (relname == NULL) { - warn (_("Skipping unknown relocation type: %u\n"), - get_reloc_type (filedata, rp->r_info)); + warn (_("Skipping unknown relocation type: %u\n"), r_type); continue; } @@ -8053,17 +8053,29 @@ slurp_hppa_unwind_table (Filedata * filedata, for (rp = rela; rp < rela + nrelas; ++rp) { - relname = elf_hppa_reloc_type (get_reloc_type (filedata, rp->r_info)); + unsigned int r_type = get_reloc_type (filedata, rp->r_info); + relname = elf_hppa_reloc_type (r_type); sym = aux->symtab + get_reloc_symindex (rp->r_info); + if (relname == NULL) + { + warn (_("Skipping unknown relocation type: %u\n"), r_type); + continue; + } + /* R_PARISC_SEGREL32 or R_PARISC_SEGREL64. */ if (! const_strneq (relname, "R_PARISC_SEGREL")) { - warn (_("Skipping unexpected relocation type %s\n"), relname); + warn (_("Skipping unexpected relocation type: %s\n"), relname); continue; } i = rp->r_offset / unw_ent_size; + if (i >= aux->table_len) + { + warn (_("Skipping reloc with overlarge offset: %lx\n"), i); + continue; + } switch ((rp->r_offset % unw_ent_size) / 4) { -- 2.30.2