ext4: fix unaligned memory access in ext4_fc_reserve_space()

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commit 8415ce07ec upstream.

As is done elsewhere in the file, build the struct ext4_fc_tl on the
stack and memcpy() it into the buffer, rather than directly writing it
to a potentially-unaligned location in the buffer.

Fixes: aa75f4d3da ("ext4: main fast-commit commit path")
Cc: <stable@vger.kernel.org> # v5.10+
Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20221106224841.279231-6-ebiggers@kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Eric Biggers 2022-11-06 14:48:39 -08:00 • committed by Greg Kroah-Hartman

parent d1c97077fa

commit 18e66ed75d

1 changed files with 21 additions and 18 deletions

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fs/ext4/fast_commit.c

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