[Qemu-devel] [PATCH] fw_cfg: Simplify error paths and avoid warnings

[Edgar E. Iglesias]

master branch doesnt build due to 3d3b8303c6f83b9b245bc774af530a6403cc4ce6

hw/fw_cfg.c: In function ‘probe_splashfile’:
hw/fw_cfg.c:66:9: error: variable ‘fop_ret’ set but not used 
[-Werror=unused-but-set-variable]
hw/fw_cfg.c: In function ‘fw_cfg_bootsplash’:
hw/fw_cfg.c:130:9: error: variable ‘fop_ret’ set but not used 
[-Werror=unused-but-set-variable]

This is a basically untested fix, compile tested only.

Cheers

---

commit fb4515b04705414ab9ea9d5deb4728b41525761e
Author: Edgar E. Iglesias <edgar.igles...@gmail.com>
Date:   Thu Aug 4 01:17:16 2011 +0200

    fw_cfg: Simplify error paths and avoid warnings
    
    Signed-off-by: Edgar E. Iglesias <edgar.igles...@gmail.com>

diff --git a/hw/fw_cfg.c b/hw/fw_cfg.c
index a29db90..8593c25 100644
--- a/hw/fw_cfg.c
+++ b/hw/fw_cfg.c
@@ -80,13 +80,15 @@ static FILE *probe_splashfile(char *filename, int 
*file_sizep, int *file_typep)
     file_size = ftell(fp);
     if (file_size < 2) {
         error_report("file size is less than 2 bytes '%s'.", filename);
-        fclose(fp);
-        fp = NULL;
-        return fp;
+        goto fail;
     }
     /* check magic ID */
     fseek(fp, 0L, SEEK_SET);
     fop_ret = fread(buf, 1, 2, fp);
+    if (fop_ret != 2) {
+        goto fail;
+    }
+
     filehead_value = (buf[0] + (buf[1] << 8)) & 0xffff;
     if (filehead_value == 0xd8ff) {
         file_type = JPG_FILE;
@@ -98,9 +100,7 @@ static FILE *probe_splashfile(char *filename, int 
*file_sizep, int *file_typep)
     if (file_type < 0) {
         error_report("'%s' not jpg/bmp file,head:0x%x.",
                          filename, filehead_value);
-        fclose(fp);
-        fp = NULL;
-        return fp;
+        goto fail;
     }
     /* check BMP bpp */
     if (file_type == BMP_FILE) {
@@ -109,15 +109,17 @@ static FILE *probe_splashfile(char *filename, int 
*file_sizep, int *file_typep)
         bmp_bpp = (buf[0] + (buf[1] << 8)) & 0xffff;
         if (bmp_bpp != 24) {
             error_report("only 24bpp bmp file is supported.");
-            fclose(fp);
-            fp = NULL;
-            return fp;
+            goto fail;
         }
     }
     /* return values */
     *file_sizep = file_size;
     *file_typep = file_type;
     return fp;
+
+fail:
+    fclose(fp);
+    return NULL;
 }
 
 static void fw_cfg_bootsplash(FWCfgState *s)
@@ -169,8 +171,8 @@ static void fw_cfg_bootsplash(FWCfgState *s)
         }
         /* probing the file */
         fp = probe_splashfile(filename, &file_size, &file_type);
+        qemu_free(filename);
         if (fp == NULL) {
-            qemu_free(filename);
             return;
         }
         /* loading file data */
@@ -182,6 +184,10 @@ static void fw_cfg_bootsplash(FWCfgState *s)
         fseek(fp, 0L, SEEK_SET);
         fop_ret = fread(boot_splash_filedata, 1, file_size, fp);
         fclose(fp);
+        if (fop_ret != file_size) {
+            return;
+        }
+
         /* insert data */
         if (file_type == JPG_FILE) {
             fw_cfg_add_file(s, "bootsplash.jpg",
@@ -190,7 +196,6 @@ static void fw_cfg_bootsplash(FWCfgState *s)
             fw_cfg_add_file(s, "bootsplash.bmp",
                     boot_splash_filedata, boot_splash_filedata_size);
         }
-        qemu_free(filename);
     }
 }