| Message ID | 20211220195022.1387104-1-marex@denx.de |
|---|---|
| State | Accepted |
| Commit | 29009604ad4e3ef784fd9b9fef6f23610ddf633d |
| Headers | show |
| Series | crypto: stm32/crc32 - Fix kernel BUG triggered in probe() | expand |
On Mon, Dec 20, 2021 at 08:50:22PM +0100, Marek Vasut wrote: > The include/linux/crypto.h struct crypto_alg field cra_driver_name description > states "Unique name of the transformation provider. " ... " this contains the > name of the chip or provider and the name of the transformation algorithm." > > In case of the stm32-crc driver, field cra_driver_name is identical for all > registered transformation providers and set to the name of the driver itself, > which is incorrect. This patch fixes it by assigning a unique cra_driver_name > to each registered transformation provider. > > The kernel crash is triggered when the driver calls crypto_register_shashes() > which calls crypto_register_shash(), which calls crypto_register_alg(), which > calls __crypto_register_alg(), which returns -EEXIST, which is propagated > back through this call chain. Upon -EEXIST from crypto_register_shash(), the > crypto_register_shashes() starts unregistering the providers back, and calls > crypto_unregister_shash(), which calls crypto_unregister_alg(), and this is > where the BUG() triggers due to incorrect cra_refcnt. > > Fixes: b51dbe90912a ("crypto: stm32 - Support for STM32 CRC32 crypto module") > Signed-off-by: Marek Vasut <marex@denx.de> > Cc: <stable@vger.kernel.org> # 4.12+ > Cc: Alexandre Torgue <alexandre.torgue@foss.st.com> > Cc: Fabien Dessenne <fabien.dessenne@st.com> > Cc: Herbert Xu <herbert@gondor.apana.org.au> > Cc: Lionel Debieve <lionel.debieve@st.com> > Cc: Nicolas Toromanoff <nicolas.toromanoff@st.com> > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-stm32@st-md-mailman.stormreply.com > To: linux-crypto@vger.kernel.org > --- > drivers/crypto/stm32/stm32-crc32.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) Patch applied. Thanks.
diff --git a/drivers/crypto/stm32/stm32-crc32.c b/drivers/crypto/stm32/stm32-crc32.c index 75867c0b0017..be1bf39a317d 100644 --- a/drivers/crypto/stm32/stm32-crc32.c +++ b/drivers/crypto/stm32/stm32-crc32.c @@ -279,7 +279,7 @@ static struct shash_alg algs[] = { .digestsize = CHKSUM_DIGEST_SIZE, .base = { .cra_name = "crc32", - .cra_driver_name = DRIVER_NAME, + .cra_driver_name = "stm32-crc32-crc32", .cra_priority = 200, .cra_flags = CRYPTO_ALG_OPTIONAL_KEY, .cra_blocksize = CHKSUM_BLOCK_SIZE, @@ -301,7 +301,7 @@ static struct shash_alg algs[] = { .digestsize = CHKSUM_DIGEST_SIZE, .base = { .cra_name = "crc32c", - .cra_driver_name = DRIVER_NAME, + .cra_driver_name = "stm32-crc32-crc32c", .cra_priority = 200, .cra_flags = CRYPTO_ALG_OPTIONAL_KEY, .cra_blocksize = CHKSUM_BLOCK_SIZE,
The include/linux/crypto.h struct crypto_alg field cra_driver_name description states "Unique name of the transformation provider. " ... " this contains the name of the chip or provider and the name of the transformation algorithm." In case of the stm32-crc driver, field cra_driver_name is identical for all registered transformation providers and set to the name of the driver itself, which is incorrect. This patch fixes it by assigning a unique cra_driver_name to each registered transformation provider. The kernel crash is triggered when the driver calls crypto_register_shashes() which calls crypto_register_shash(), which calls crypto_register_alg(), which calls __crypto_register_alg(), which returns -EEXIST, which is propagated back through this call chain. Upon -EEXIST from crypto_register_shash(), the crypto_register_shashes() starts unregistering the providers back, and calls crypto_unregister_shash(), which calls crypto_unregister_alg(), and this is where the BUG() triggers due to incorrect cra_refcnt. Fixes: b51dbe90912a ("crypto: stm32 - Support for STM32 CRC32 crypto module") Signed-off-by: Marek Vasut <marex@denx.de> Cc: <stable@vger.kernel.org> # 4.12+ Cc: Alexandre Torgue <alexandre.torgue@foss.st.com> Cc: Fabien Dessenne <fabien.dessenne@st.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Lionel Debieve <lionel.debieve@st.com> Cc: Nicolas Toromanoff <nicolas.toromanoff@st.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-stm32@st-md-mailman.stormreply.com To: linux-crypto@vger.kernel.org --- drivers/crypto/stm32/stm32-crc32.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)