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| author | Roberto Sassu <[email protected]> | 2020-04-27 12:28:56 +0200 |
|---|---|---|
| committer | Mimi Zohar <[email protected]> | 2020-05-07 21:30:58 -0400 |
| commit | 53de3b080d5eae31d0de219617155dcc34e7d698 (patch) | |
| tree | f163f0adbe08a441fa3f511bedf14db99a8da68c /drivers/fpga/fpga-mgr.c | |
| parent | 0014cc04e8ec077dc482f00c87dfd949cfe2b98f (diff) | |
evm: Check also if *tfm is an error pointer in init_desc()
This patch avoids a kernel panic due to accessing an error pointer set by
crypto_alloc_shash(). It occurs especially when there are many files that
require an unsupported algorithm, as it would increase the likelihood of
the following race condition:
Task A: *tfm = crypto_alloc_shash() <= error pointer
Task B: if (*tfm == NULL) <= *tfm is not NULL, use it
Task B: rc = crypto_shash_init(desc) <= panic
Task A: *tfm = NULL
This patch uses the IS_ERR_OR_NULL macro to determine whether or not a new
crypto context must be created.
Cc: [email protected]
Fixes: d46eb3699502b ("evm: crypto hash replaced by shash")
Co-developed-by: Krzysztof Struczynski <[email protected]>
Signed-off-by: Krzysztof Struczynski <[email protected]>
Signed-off-by: Roberto Sassu <[email protected]>
Signed-off-by: Mimi Zohar <[email protected]>
Diffstat (limited to 'drivers/fpga/fpga-mgr.c')
0 files changed, 0 insertions, 0 deletions