pstore/ram: Do not treat empty buffers as valid

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[ Upstream commit 30696378f6 ]

The ramoops backend currently calls persistent_ram_save_old() even
if a buffer is empty. While this appears to work, it is does not seem
like the right thing to do and could lead to future bugs so lets avoid
that. It also prevents misleading prints in the logs which claim the
buffer is valid.

I got something like:

	found existing buffer, size 0, start 0

When I was expecting:

	no valid data in buffer (sig = ...)

This bails out early (and reports with pr_debug()), since it's an
acceptable state.

Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Co-developed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Joel Fernandes (Google) 2018-11-03 16:38:18 -07:00 • committed by Greg Kroah-Hartman

parent 6029666fd5

commit 9e969ba431

1 changed files with 5 additions and 0 deletions

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fs/pstore/ram_core.c

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