tree 1cfc04f11647a0a0a5012195205acc33066b8830
parent 955dbbc60825f0e60b44231d6e95003562ef1c3a
author Paul Emge <paulemge@forallsecure.com> 1562629025 -0700
committer Tom Rini <trini@konsulko.com> 1563463889 -0400

CVE-2019-13104: ext4: check for underflow in ext4fs_read_file

in ext4fs_read_file, it is possible for a broken/malicious file
system to cause a memcpy of a negative number of bytes, which
overflows all memory. This patch fixes the issue by checking for
a negative length.

Signed-off-by: Paul Emge <paulemge@forallsecure.com>