https://sourceware.org/bugzilla/show_bug.cgi?id=32650
Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|ASSIGNED |RESOLVED
--- Comment #2 from Mark Wielaard <mark at klomp dot org> ---
commit 2636426a091bd6c6f7f02e49ab20d4cdc6bfc753
Author: Mark Wielaard <[email protected]>
Date: Sat Feb 8 20:00:12 2025 +0100
libdw: Simplify __libdw_getabbrev and fix dwarf_offabbrev issue
__libdw_getabbrev could crash on reading a bad abbrev by trying to
deallocate memory it didn't allocate itself. This could happen because
dwarf_offabbrev would supply its own memory when calling
__libdw_getabbrev. No other caller did this.
Simplify the __libdw_getabbrev common code by not taking external
memory to put the abbrev result in (this would also not work correctly
if the abbrev was already cached). And make dwarf_offabbrev explicitly
copy the result (if there was no error or end of abbrev).
* libdw/dwarf_getabbrev.c (__libdw_getabbrev): Don't take
Dwarf_Abbrev result argument. Always just allocate abb when
abbrev not found in cache.
(dwarf_getabbrev): Don't pass NULL as last argument to
__libdw_getabbrev.
* libdw/dwarf_tag.c (__libdw_findabbrev): Likewise.
* libdw/dwarf_offabbrev.c (dwarf_offabbrev): Likewise. And copy
abbrev into abbrevp on success.
* libdw/libdw.h (dwarf_offabbrev): Document return values.
* libdw/libdwP.h (__libdw_getabbrev): Don't take Dwarf_Abbrev
result argument.
https://sourceware.org/bugzilla/show_bug.cgi?id=32650
Signed-off-by: Mark Wielaard <[email protected]>
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