If the 64-bit file system feature is enabled, then mke2fs would crash
due to a divide-by-zero error caused by s_desc_size not being
initialized yet.
Reported-by: George Spelvin <linux@xxxxxxxxxxx>
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
---
misc/mke2fs.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index 7ec8cc2..0f9a299 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -1873,6 +1873,14 @@ profile_error:
blocksize = EXT2_BLOCK_SIZE(&fs_param);
+ /*
+ * Initialize s_desc_size so that the parse_extended_opts()
+ * can correctly handle "-E resize=NNN" if the 64-bit option
+ * is set.
+ */
+ if (fs_param.s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
+ fs_param.s_desc_size = EXT2_MIN_DESC_SIZE_64BIT;
+
/* This check should happen beyond the last assignment to blocksize */
if (blocksize > sys_page_size) {
if (!force) {
--
1.7.12.rc0.22.gcdd159b
--
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