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Index: sys/fs/ext2fs/ext2_vfsops.c
===================================================================
--- sys/fs/ext2fs/ext2_vfsops.c
+++ sys/fs/ext2fs/ext2_vfsops.c
@@ -465,6 +465,13 @@
int g_count = 0;
int error;
+ /* Check if dblock is zero */
+ if (!fs->e2fs_first_dblock) {
+ SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
+ "dblock is zero");
+ return (EINVAL);
+ }
+
/* Check checksum features */
if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) &&
EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {

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