forked from luck/tmp_suning_uos_patched
pstore: Check for prz allocation in walker
Instead of needing additional checks in callers for unallocated przs, perform the check in the walker, which gives us a more universal way to handle the situation. Signed-off-by: Kees Cook <keescook@chromium.org>
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@ -133,7 +133,8 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
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struct persistent_ram_zone *prz;
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int i = (*c)++;
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if (i >= max)
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/* Give up if we never existed or have hit the end. */
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if (!przs || i >= max)
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return NULL;
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prz = przs[i];
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@ -280,7 +281,7 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
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1, id, type, PSTORE_TYPE_PMSG, 0);
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/* ftrace is last since it may want to dynamically allocate memory. */
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if (!prz_ok(prz) && cxt->fprzs) {
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if (!prz_ok(prz)) {
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if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)) {
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prz = ramoops_get_next_prz(cxt->fprzs,
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&cxt->ftrace_read_cnt, 1, id, type,
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