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-rw-r--r--fs/pstore/ram.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index db9f67d34af3..2c549b5dd4aa 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -407,6 +407,17 @@ static int notrace ramoops_pstore_write(struct pstore_record *record)
prz = cxt->dprzs[cxt->dump_write_cnt];
+ /*
+ * Since this is a new crash dump, we need to reset the buffer in
+ * case it still has an old dump present. Without this, the new dump
+ * will get appended, which would seriously confuse anything trying
+ * to check dump file contents. Specifically, ramoops_read_kmsg_hdr()
+ * expects to find a dump header in the beginning of buffer data, so
+ * we must to reset the buffer values, in order to ensure that the
+ * header will be written to the beginning of the buffer.
+ */
+ persistent_ram_zap(prz);
+
/* Build header and append record contents. */
hlen = ramoops_write_kmsg_hdr(prz, record);
if (!hlen)
@@ -572,6 +583,7 @@ static int ramoops_init_przs(const char *name,
prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig,
&cxt->ecc_info,
cxt->memtype, flags, label);
+ kfree(label);
if (IS_ERR(prz_ar[i])) {
err = PTR_ERR(prz_ar[i]);
dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
@@ -617,6 +629,7 @@ static int ramoops_init_prz(const char *name,
label = kasprintf(GFP_KERNEL, "ramoops:%s", name);
*prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info,
cxt->memtype, PRZ_FLAG_ZAP_OLD, label);
+ kfree(label);
if (IS_ERR(*prz)) {
int err = PTR_ERR(*prz);