nvram_clear_error_log() calls ppc_md.nvram_write() even when
nvram_error_log_index is -1 (invalid). The nvram_write() function does
not check for a negative offset.
Check nvram_error_log_index as the other nvram log functions do.
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org>
Cc: linuxppc-...@ozlabs.org
---
arch/powerpc/kernel/nvram_64.c | 3 +++
1 file changed, 3 insertions(+)
Index: linux-2.6-tip/arch/powerpc/kernel/nvram_64.c
===================================================================
--- linux-2.6-tip.orig/arch/powerpc/kernel/nvram_64.c
+++ linux-2.6-tip/arch/powerpc/kernel/nvram_64.c
@@ -681,6 +681,9 @@ int nvram_clear_error_log(void)
int clear_word = ERR_FLAG_ALREADY_LOGGED;
int rc;
+ if (nvram_error_log_index == -1)
+ return -1;
+
tmp_index = nvram_error_log_index;
rc = ppc_md.nvram_write((char *)&clear_word, sizeof(int), &tmp_index);
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