pstore: Set tfm to NULL on free_buf_for_compression

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Set tfm to NULL on free_buf_for_compression() after crypto_free_comp().

This avoid a use-after-free when allocate_buf_for_compression()
and free_buf_for_compression() are called twice. Although
free_buf_for_compression() freed the tfm, allocate_buf_for_compression()
won't reinitialize the tfm since the tfm pointer is not NULL.

Fixes: 95047b0519 ("pstore: Refactor compression initialization")
Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>

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Pi-Hsun Shih 2019-05-20 14:51:19 +08:00 • committed by Kees Cook

parent a188339ca5

commit a9fb94a99b

1 changed files with 3 additions and 1 deletions

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fs/pstore/platform.c

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