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Re: [ARM] Avoid dereferencing null pointers
On Tue, Oct 23, 2018 at 04:21:41PM +0200, Christophe Lyon wrote:
> Hi,
>
> While building an ARM FDPIC toolchain with a compiler generating Thumb
> code, I face a couple of null pointer dereferences in cmse_scan().
>
> When browsing ld-uClibc.so.1, all the external symbols have no info in
> sym_hashes (sym_hashes[X] == NULL), and when handling libgcc_s.so.1
> for the 2nd time in the same command, sym_hashes == NULL.
>
> I don't know why this doesn't happen with a compiler generating Arm
> code (ie. why the symbol tables are handled differently), but the
> attached small patch prevents the linker from crashing.
>
> OK?
No, this is just papering over the real problem. You need to find out
why the sym hashes are not being set up (or are being overwritten).
--
Alan Modra
Australia Development Lab, IBM