[PATCH v5] cxl-cdat:Fix open file not closed in ct3_load_cdat

[Hao Zeng]

Open file descriptor not closed in error paths. Fix by replace
open coded handling of read of whole file into a buffer with
g_file_get_contents()

Fixes: aba578bdac ("hw/cxl: CDAT Data Object Exchange implementation")
Signed-off-by: Zeng Hao <zenghao@kylinos.cn>
Suggested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Suggested-by: Jonathan Cameron via <qemu-devel@nongnu.org>

---
ChangeLog:
    v4-v5:
        fixes some style issues and keep the protection after using g_free()
    v3-v4:
        Modify commit information,No code change.
    v2->v3:
        Submission of v3 on the basis of v2, based on Philippe Mathieu-Daudé's 
suggestion
        "Pointless bzero in g_malloc0, however this code would be
         simplified using g_file_get_contents()."
    v1->v2:
        - Patch 1: No change in patch v1
        - Patch 2: Fix the check on the return value of fread() in ct3_load_cdat
---
 hw/cxl/cxl-cdat.c | 27 ++++++++-------------------
 1 file changed, 8 insertions(+), 19 deletions(-)

diff --git a/hw/cxl/cxl-cdat.c b/hw/cxl/cxl-cdat.c
index 137abd0992..dd69366797 100644
--- a/hw/cxl/cxl-cdat.c
+++ b/hw/cxl/cxl-cdat.c
@@ -110,29 +110,18 @@ static void ct3_load_cdat(CDATObject *cdat, Error **errp)
     g_autofree CDATEntry *cdat_st = NULL;
     uint8_t sum = 0;
     int num_ent;
-    int i = 0, ent = 1, file_size = 0;
+    int i = 0, ent = 1;
+    gsize file_size = 0;
     CDATSubHeader *hdr;
-    FILE *fp = NULL;
+    GError *error = NULL;
 
     /* Read CDAT file and create its cache */
-    fp = fopen(cdat->filename, "r");
-    if (!fp) {
-        error_setg(errp, "CDAT: Unable to open file");
+    if (!g_file_get_contents(cdat->filename, (gchar **)&cdat->buf,
+                             &file_size, &error)) {
+        error_setg(errp, "CDAT: File read failed: %s", error->message);
+        g_error_free(error);
         return;
     }
-
-    fseek(fp, 0, SEEK_END);
-    file_size = ftell(fp);
-    fseek(fp, 0, SEEK_SET);
-    cdat->buf = g_malloc0(file_size);
-
-    if (fread(cdat->buf, file_size, 1, fp) == 0) {
-        error_setg(errp, "CDAT: File read failed");
-        return;
-    }
-
-    fclose(fp);
-
     if (file_size < sizeof(CDATTableHeader)) {
         error_setg(errp, "CDAT: File too short");
         return;
@@ -219,6 +208,6 @@ void cxl_doe_cdat_release(CXLComponentState *cxl_cstate)
                               cdat->private);
     }
     if (cdat->buf) {
-        free(cdat->buf);
+        g_free(cdat->buf);
     }
 }
-- 
2.37.2

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