1 files changed, 22 insertions, 9 deletions

diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index 127408069ca7..631b9477b99c 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -932,7 +932,8 @@ static int erst_check_table(struct acpi_table_erst *erst_tab)
 static int erst_open_pstore(struct pstore_info *psi);
 static int erst_close_pstore(struct pstore_info *psi);
 static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,
-                           struct timespec *time, struct pstore_info *psi);
+                           struct timespec *time, char **buf,
+                           struct pstore_info *psi);
 static int erst_writer(enum pstore_type_id type, u64 *id, unsigned int part,
                        size_t size, struct pstore_info *psi);
 static int erst_clearer(enum pstore_type_id type, u64 id,
@@ -986,17 +987,23 @@ static int erst_close_pstore(struct pstore_info *psi)
 }
 
 static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,
-                           struct timespec *time, struct pstore_info *psi)
+                           struct timespec *time, char **buf,
+                           struct pstore_info *psi)
 {
         int rc;
         ssize_t len = 0;
         u64 record_id;
-        struct cper_pstore_record *rcd = (struct cper_pstore_record *)
-                                        (erst_info.buf - sizeof(*rcd));
+        struct cper_pstore_record *rcd;
+        size_t rcd_len = sizeof(*rcd) + erst_info.bufsize;
 
         if (erst_disable)
                 return -ENODEV;
 
+        rcd = kmalloc(rcd_len, GFP_KERNEL);
+        if (!rcd) {
+                rc = -ENOMEM;
+                goto out;
+        }
 skip:
         rc = erst_get_record_id_next(&reader_pos, &record_id);
         if (rc)
@@ -1004,22 +1011,27 @@ skip:
 
         /* no more record */
         if (record_id == APEI_ERST_INVALID_RECORD_ID) {
-                rc = -1;
+                rc = -EINVAL;
                 goto out;
         }
 
-        len = erst_read(record_id, &rcd->hdr, sizeof(*rcd) +
-                        erst_info.bufsize);
+        len = erst_read(record_id, &rcd->hdr, rcd_len);
         /* The record may be cleared by others, try read next record */
         if (len == -ENOENT)
                 goto skip;
-        else if (len < 0) {
-                rc = -1;
+        else if (len < sizeof(*rcd)) {
+                rc = -EIO;
                 goto out;
         }
         if (uuid_le_cmp(rcd->hdr.creator_id, CPER_CREATOR_PSTORE) != 0)
                 goto skip;
 
+        *buf = kmalloc(len, GFP_KERNEL);
+        if (*buf == NULL) {
+                rc = -ENOMEM;
+                goto out;
+        }
+        memcpy(*buf, rcd->data, len - sizeof(*rcd));
         *id = record_id;
         if (uuid_le_cmp(rcd->sec_hdr.section_type,
                         CPER_SECTION_TYPE_DMESG) == 0)
@@ -1037,6 +1049,7 @@ skip:
         time->tv_nsec = 0;
 
 out:
+        kfree(rcd);
         return (rc < 0) ? rc : (len - sizeof(*rcd));
 }