fs/fat/fs_fat32util.c: fix potential exception due to dividing zero d…

…uring mounting when fat is corrupted Check fs_fatsecperclus' value when read from eMMC device. Return an error if it is zero. Signed-off-by: Yinzhe Wu <[email protected]> Reviewed-by: Jacky Cao <[email protected]> Tested-by: Yinzhe Wu <[email protected]>
sdc-g · Dec 13, 2024 · 5cdc6c7 · 5cdc6c7
1 parent 1525054
commit 5cdc6c7
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/fs/fat/fs_fat32util.c b/fs/fat/fs_fat32util.c
@@ -213,6 +213,11 @@ static int fat_checkbootrecord(struct fat_mountpt_s *fs)
   /* Get the sectors per cluster */
 
   fs->fs_fatsecperclus = FBR_GETSECPERCLUS(fs->fs_buffer);
+  if (fs->fs_fatsecperclus == 0)
+    {
+      fwarn("WARNING: sectors per cluster cannot be 0\n");
+      return -EINVAL;
+    }
 
   /* Calculate the number of clusters */