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Subject[PATCH 3/4] crypto: caam - fix use-after-free KASAN issue for HASH algorithms
Date
Here's the KASAN report:
BUG: KASAN: use-after-free in ahash_done+0xdc/0x3b8
Read of size 1 at addr ffff000022e75510 by task swapper/0/0

CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-00164-gcb59d59-dirty #20
Hardware name: LS1046A RDB Board (DT)
Call trace:
dump_backtrace+0x0/0x260
show_stack+0x14/0x20
dump_stack+0xe8/0x144
print_address_description.isra.11+0x64/0x348
__kasan_report+0x11c/0x230
kasan_report+0xc/0x18
__asan_load1+0x5c/0x68
ahash_done+0xdc/0x3b8
caam_jr_dequeue+0x390/0x608
tasklet_action_common.isra.13+0x1ec/0x230

Fixes: 21b014f038d3 ("crypto: caam - add crypto_engine support for HASH algorithms")
Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
---
drivers/crypto/caam/caamhash.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c
index 943bc02..3c63fe0 100644
--- a/drivers/crypto/caam/caamhash.c
+++ b/drivers/crypto/caam/caamhash.c
@@ -593,7 +593,6 @@ static inline void ahash_done_cpy(struct device *jrdev, u32 *desc, u32 err,

ahash_unmap_ctx(jrdev, edesc, req, digestsize, dir);
memcpy(req->result, state->caam_ctx, digestsize);
- kfree(edesc);

print_hex_dump_debug("ctx@"__stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, state->caam_ctx,
@@ -607,6 +606,8 @@ static inline void ahash_done_cpy(struct device *jrdev, u32 *desc, u32 err,
req->base.complete(&req->base, ecode);
else
crypto_finalize_hash_request(jrp->engine, req, ecode);
+
+ kfree(edesc);
}

static void ahash_done(struct device *jrdev, u32 *desc, u32 err,
@@ -640,7 +641,6 @@ static inline void ahash_done_switch(struct device *jrdev, u32 *desc, u32 err,
ecode = caam_jr_strstatus(jrdev, err);

ahash_unmap_ctx(jrdev, edesc, req, ctx->ctx_len, dir);
- kfree(edesc);

scatterwalk_map_and_copy(state->buf, req->src,
req->nbytes - state->next_buflen,
@@ -668,6 +668,7 @@ static inline void ahash_done_switch(struct device *jrdev, u32 *desc, u32 err,
else
crypto_finalize_hash_request(jrp->engine, req, ecode);

+ kfree(edesc);
}

static void ahash_done_bi(struct device *jrdev, u32 *desc, u32 err,
--
2.1.0
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