[PATCH 3/8] crypto: stm32/cryp - fix CTR counter carry
From: Nicolas Toromanoff <hidden>
Date: 2021-10-29 14:01:19
Also in:
linux-crypto, lkml
Subsystem:
crypto api, the rest · Maintainers:
Herbert Xu, "David S. Miller", Linus Torvalds
Fix issue in CTR counter overflow, the carry-over is now properly
managed.
Fixes: bbb2832620ac ("crypto: stm32 - Fix sparse warnings")
Signed-off-by: Nicolas Toromanoff <redacted>
---
drivers/crypto/stm32/stm32-cryp.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)
diff --git a/drivers/crypto/stm32/stm32-cryp.c b/drivers/crypto/stm32/stm32-cryp.c
index 7b55ad6d2f1a..6eeeca0d70ce 100644
--- a/drivers/crypto/stm32/stm32-cryp.c
+++ b/drivers/crypto/stm32/stm32-cryp.c@@ -163,7 +163,7 @@ struct stm32_cryp { struct scatter_walk in_walk; struct scatter_walk out_walk; - u32 last_ctr[4]; + __be32 last_ctr[4]; u32 gcm_ctr; };
@@ -1219,25 +1219,26 @@ static void stm32_cryp_check_ctr_counter(struct stm32_cryp *cryp) if (unlikely(cryp->last_ctr[3] == 0xFFFFFFFF)) { cryp->last_ctr[3] = 0; - cryp->last_ctr[2]++; + cryp->last_ctr[2] = cpu_to_be32(be32_to_cpu(cryp->last_ctr[2]) + 1); if (!cryp->last_ctr[2]) { - cryp->last_ctr[1]++; + cryp->last_ctr[1] = cpu_to_be32(be32_to_cpu(cryp->last_ctr[1]) + 1); if (!cryp->last_ctr[1]) - cryp->last_ctr[0]++; + cryp->last_ctr[0] = cpu_to_be32(be32_to_cpu(cryp->last_ctr[0]) + 1); } cr = stm32_cryp_read(cryp, CRYP_CR); stm32_cryp_write(cryp, CRYP_CR, cr & ~CR_CRYPEN); - stm32_cryp_hw_write_iv(cryp, (__be32 *)cryp->last_ctr); + stm32_cryp_hw_write_iv(cryp, cryp->last_ctr); stm32_cryp_write(cryp, CRYP_CR, cr); } - cryp->last_ctr[0] = stm32_cryp_read(cryp, CRYP_IV0LR); - cryp->last_ctr[1] = stm32_cryp_read(cryp, CRYP_IV0RR); - cryp->last_ctr[2] = stm32_cryp_read(cryp, CRYP_IV1LR); - cryp->last_ctr[3] = stm32_cryp_read(cryp, CRYP_IV1RR); + /* The IV registers are BE */ + cryp->last_ctr[0] = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV0LR)); + cryp->last_ctr[1] = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV0RR)); + cryp->last_ctr[2] = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV1LR)); + cryp->last_ctr[3] = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV1RR)); } static bool stm32_cryp_irq_read_data(struct stm32_cryp *cryp)
--
2.17.1
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