On Tue, Dec 16, 2014 at 12:16:12PM +1000, Mitchell Krome wrote:
> In filename__read_build_id, phdr points to memory in buf, which gets realloced
> before a call to fseek that uses phdr->p_offset. This change stores the value
> of p_offset before buf is realloced, so the fseek can use the value safely.
>
> Signed-off-by: Mitchell Krome <mitchellkr...@gmail.com>
> ---
> tools/perf/util/symbol-minimal.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/symbol-minimal.c
> b/tools/perf/util/symbol-minimal.c
> index fa585c6..d7efb03 100644
> --- a/tools/perf/util/symbol-minimal.c
> +++ b/tools/perf/util/symbol-minimal.c
> @@ -129,6 +129,7 @@ int filename__read_build_id(const char *filename, void
> *bf, size_t size)
>
> for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
> void *tmp;
> + long offset;
>
> if (need_swap) {
> phdr->p_type = bswap_32(phdr->p_type);
> @@ -140,12 +141,13 @@ int filename__read_build_id(const char *filename, void
> *bf, size_t size)
> continue;
>
> buf_size = phdr->p_filesz;
> + offset = phdr->p_offset;
> tmp = realloc(buf, buf_size);
> if (tmp == NULL)
> goto out_free;
>
> buf = tmp;
> - fseek(fp, phdr->p_offset, SEEK_SET);
> + fseek(fp, offset, SEEK_SET);
so the concern is that the realloc buf_size will be smaller
than the 'buf' offset of phdr->p_offset value, right? Anyway:
Acked-by: Jiri Olsa <jo...@kernel.org>
jirka
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