In preparation for handling records off to pstore_mkfile(), allocate the
record instead of reusing stack. This still always frees the record,
though, since pstore_mkfile() isn't yet keeping it.
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
fs/pstore/platform.c | 30 ++++++++++++++++++++++--------
1 file changed, 22 insertions(+), 8 deletions(-)
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index d897e2f11b6a..072326625629 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -818,8 +818,7 @@ static void decompress_record(struct pstore_record *record)
void pstore_get_records(int quiet)
{
struct pstore_info *psi = psinfo;
- struct pstore_record record = { .psi = psi, };
- int failed = 0, rc;
+ int failed = 0;
if (!psi)
return;
@@ -833,19 +832,34 @@ void pstore_get_records(int quiet)
* may reallocate record.buf. On success, pstore_mkfile() will keep
* the record.buf, so free it only on failure.
*/
- while ((record.size = psi->read(&record)) > 0) {
- decompress_record(&record);
- rc = pstore_mkfile(&record);
+ for (;;) {
+ struct pstore_record *record;
+ int rc;
+
+ record = kzalloc(sizeof(*record), GFP_KERNEL);
+ if (!record) {
+ pr_err("out of memory creating record\n");
+ break;
+ }
+ record->psi = psi;
+
+ record->size = psi->read(record);
+
+ /* No more records left in backend? */
+ if (record->size <= 0)
+ break;
+
+ decompress_record(record);
+ rc = pstore_mkfile(record);
if (rc) {
/* pstore_mkfile() did not take buf, so free it. */
- kfree(record.buf);
+ kfree(record->buf);
if (rc != -EEXIST || !quiet)
failed++;
}
/* Reset for next record. */
- memset(&record, 0, sizeof(record));
- record.psi = psi;
+ kfree(record);
}
if (psi->close)
psi->close(psi);
--
2.7.4
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