ext4 crypto: fix memory leak in ext4_bio_write_page()

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commit 937d7b84dc upstream.

There are times when ext4_bio_write_page() is called even though we
don't actually need to do any I/O.  This happens when ext4_writepage()
gets called by the jbd2 commit path when an inode needs to force its
pages written out in order to provide data=ordered guarantees --- and
a page is backed by an unwritten (e.g., uninitialized) block on disk,
or if delayed allocation means the page's backing store hasn't been
allocated yet.  In that case, we need to skip the call to
ext4_encrypt_page(), since in addition to wasting CPU, it leads to a
bounce page and an ext4 crypto context getting leaked.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Theodore Ts'o 2015-10-02 23:54:58 -04:00 • committed by Greg Kroah-Hartman

parent 0330982c45

commit b8a7a30104

1 changed files with 4 additions and 1 deletions

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fs/ext4/page-io.c

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