From: Hangbin Liu liuhangbin@gmail.com

stable inclusion from stable-v4.19.316 commit afd5730969aec960a2fee4e5ee839a6014643976 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAC3N0 CVE: CVE-2024-39489

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit efb9f4f19f8e37fde43dfecebc80292d179f56c6 ]

seg6_hmac_init_algo returns without cleaning up the previous allocations if one fails, so it's going to leak all that memory and the crypto tfms.

Update seg6_hmac_exit to only free the memory when allocated, so we can reuse the code directly.

Fixes: bf355b8d2c30 ("ipv6: sr: add core files for SR HMAC support") Reported-by: Sabrina Dubroca sd@queasysnail.net Closes: https://lore.kernel.org/netdev/Zj3bh-gE7eT6V6aH@hog/ Signed-off-by: Hangbin Liu liuhangbin@gmail.com Reviewed-by: Simon Horman horms@kernel.org Reviewed-by: Sabrina Dubroca sd@queasysnail.net Link: https://lore.kernel.org/r/20240517005435.2600277-1-liuhangbin@gmail.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zhengchao Shao shaozhengchao@huawei.com --- net/ipv6/seg6_hmac.c | 42 ++++++++++++++++++++++++++++-------------- 1 file changed, 28 insertions(+), 14 deletions(-)

diff --git a/net/ipv6/seg6_hmac.c b/net/ipv6/seg6_hmac.c index 8546f94f30d4..a8f0eac64a19 100644 --- a/net/ipv6/seg6_hmac.c +++ b/net/ipv6/seg6_hmac.c @@ -361,6 +361,7 @@ static int seg6_hmac_init_algo(void) struct crypto_shash *tfm; struct shash_desc *shash; int i, alg_count, cpu; + int ret = -ENOMEM;

alg_count = ARRAY_SIZE(hmac_algos);

@@ -371,12 +372,14 @@ static int seg6_hmac_init_algo(void) algo = &hmac_algos[i]; algo->tfms = alloc_percpu(struct crypto_shash *); if (!algo->tfms) - return -ENOMEM; + goto error_out;

for_each_possible_cpu(cpu) { tfm = crypto_alloc_shash(algo->name, 0, 0); - if (IS_ERR(tfm)) - return PTR_ERR(tfm); + if (IS_ERR(tfm)) { + ret = PTR_ERR(tfm); + goto error_out; + } p_tfm = per_cpu_ptr(algo->tfms, cpu); *p_tfm = tfm; } @@ -388,18 +391,22 @@ static int seg6_hmac_init_algo(void)

algo->shashs = alloc_percpu(struct shash_desc *); if (!algo->shashs) - return -ENOMEM; + goto error_out;

for_each_possible_cpu(cpu) { shash = kzalloc_node(shsize, GFP_KERNEL, cpu_to_node(cpu)); if (!shash) - return -ENOMEM; + goto error_out; *per_cpu_ptr(algo->shashs, cpu) = shash; } }

return 0; + +error_out: + seg6_hmac_exit(); + return ret; }

int __init seg6_hmac_init(void) @@ -421,22 +428,29 @@ EXPORT_SYMBOL(seg6_hmac_net_init); void seg6_hmac_exit(void) { struct seg6_hmac_algo *algo = NULL; + struct crypto_shash *tfm; + struct shash_desc *shash; int i, alg_count, cpu;

alg_count = ARRAY_SIZE(hmac_algos); for (i = 0; i < alg_count; i++) { algo = &hmac_algos[i]; - for_each_possible_cpu(cpu) { - struct crypto_shash *tfm; - struct shash_desc *shash;

- shash = *per_cpu_ptr(algo->shashs, cpu); - kfree(shash); - tfm = *per_cpu_ptr(algo->tfms, cpu); - crypto_free_shash(tfm); + if (algo->shashs) { + for_each_possible_cpu(cpu) { + shash = *per_cpu_ptr(algo->shashs, cpu); + kfree(shash); + } + free_percpu(algo->shashs); + } + + if (algo->tfms) { + for_each_possible_cpu(cpu) { + tfm = *per_cpu_ptr(algo->tfms, cpu); + crypto_free_shash(tfm); + } + free_percpu(algo->tfms); } - free_percpu(algo->tfms); - free_percpu(algo->shashs); } } EXPORT_SYMBOL(seg6_hmac_exit);