kernel_fpu_begin() disables preemption. gcm_crypt() has a
skcipher_walk_done() invocation within a preempt disabled section.
skcipher_walk_done() can invoke kfree() which requires sleeping locks on
PREEMPT_RT and must not be invoked with disabled preemption.
Keep FPU access enabled while skcipher_walk_done() is invoked.
Fixes: b06affb1cb580 ("crypto: x86/aes-gcm - add VAES and AVX512 / AVX10 optimized AES-GCM")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
arch/x86/crypto/aesni-intel_glue.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c
index cd37de5ec4046..be92e4c3f9c7f 100644
--- a/arch/x86/crypto/aesni-intel_glue.c
+++ b/arch/x86/crypto/aesni-intel_glue.c
@@ -1403,7 +1403,9 @@ gcm_crypt(struct aead_request *req, int flags)
aes_gcm_update(key, le_ctr, ghash_acc,
walk.src.virt.addr, walk.dst.virt.addr,
nbytes, flags);
+ kernel_fpu_end();
err = skcipher_walk_done(&walk, 0);
+ kernel_fpu_begin();
/*
* The low word of the counter isn't used by the
* finalize, so there's no need to increment it here.
--
2.45.2
