tree 9240ee74aa863ea27f5e9c89e1e3cf0e4784c032
parent 4188188bdc3aed29eb41fb1537305cff7431d062
author Theodore Ts'o <tytso@mit.edu> 1331523016 -0400
committer Theodore Ts'o <tytso@mit.edu> 1331523016 -0400

ext4: check for zero length extent

Explicitly test for an extent whose length is zero, and flag that as a
corrupted extent.

This avoids a kernel BUG_ON assertion failure.

Tested: Without this patch, the file system image found in
tests/f_ext_zero_len/image.gz in the latest e2fsprogs sources causes a
kernel panic.  With this patch, an ext4 file system error is noted
instead, and the file system is marked as being corrupted.

https://bugzilla.kernel.org/show_bug.cgi?id=42859

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org