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topology: Check address and length before string copy

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elem_copy_text() is widely used for string copy in topology. Because some
name fields are not mandatory for users, sometimes the source can be
invalid and we should not do the copy. So we add check here.

Signed-off-by: Mengdong Lin <mengdong.lin@linux.intel.com>
Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Mengdong Lin 2016-07-20 09:53:12 +08:00 • committed by Takashi Iwai
parent 1a0d49be70
commit 9797e98930
1 changed files with 3 additions and 0 deletions
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3
src/topology/tplg_local.h
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@ -253,6 +253,9 @@ struct tplg_elem* tplg_elem_new_common(snd_tplg_t *tplg,
static inline void elem_copy_text(char *dest, const char *src, int len)
{
if (!dest || !src || !len)
return;
strncpy(dest, src, len);
dest[len - 1] = 0;
}