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libbacktrace: don't crash if ELF file has no sections

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Patch from Roland McGrath.

Fixes #41
This commit is contained in:
Ian Lance Taylor
2020-05-09 20:34:25 -07:00
parent ca0de0517f
commit 7206f5bd06
1 changed files with 3 additions and 0 deletions
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3
elf.c
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@@ -2781,6 +2781,9 @@ elf_add (struct backtrace_state *state, const char *filename, int descriptor,
backtrace_release_view (state, &shdr_view, error_callback, data); backtrace_release_view (state, &shdr_view, error_callback, data);
} }
if (shnum == 0 || shstrndx == 0)
goto fail;
/* To translate PC to file/line when using DWARF, we need to find /* To translate PC to file/line when using DWARF, we need to find
the .debug_info and .debug_line sections. */ the .debug_info and .debug_line sections. */