From: Zhipeng Lu alexious@zju.edu.cn

mainline inclusion from mainline-v6.9-rc1 commit e67b652d8e8591d3b1e569dbcdfcee15993e91fa category: bugfix bugzilla: 189914, https://gitee.com/src-openeuler/kernel/issues/I9L9IF CVE: CVE-2023-52653

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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The ctx->mech_used.data allocated by kmemdup is not freed in neither gss_import_v2_context nor it only caller gss_krb5_import_sec_context, which frees ctx on error.

Thus, this patch reform the last call of gss_import_v2_context to the gss_krb5_import_ctx_v2, preventing the memleak while keepping the return formation.

Fixes: 47d848077629 ("gss_krb5: handle new context format from gssd") Signed-off-by: Zhipeng Lu alexious@zju.edu.cn Reviewed-by: Jeff Layton jlayton@kernel.org Signed-off-by: Chuck Lever chuck.lever@oracle.com Conflicts: net/sunrpc/auth_gss/gss_krb5_mech.c [commit 279a67cdd491 was not merged] Signed-off-by: Dong Chenchen dongchenchen2@huawei.com --- net/sunrpc/auth_gss/gss_krb5_mech.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/net/sunrpc/auth_gss/gss_krb5_mech.c b/net/sunrpc/auth_gss/gss_krb5_mech.c index 893d8a480592..f4f3ca817068 100644 --- a/net/sunrpc/auth_gss/gss_krb5_mech.c +++ b/net/sunrpc/auth_gss/gss_krb5_mech.c @@ -588,6 +588,7 @@ gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx, { int keylen; u32 time32; + int ret;

p = simple_get_bytes(p, end, &ctx->flags, sizeof(ctx->flags)); if (IS_ERR(p)) @@ -644,16 +645,28 @@ gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx,

switch (ctx->enctype) { case ENCTYPE_DES3_CBC_RAW: - return context_derive_keys_des3(ctx, gfp_mask); + ret = context_derive_keys_des3(ctx, gfp_mask); + break; case ENCTYPE_ARCFOUR_HMAC: - return context_derive_keys_rc4(ctx); + ret = context_derive_keys_rc4(ctx); + break; case ENCTYPE_AES128_CTS_HMAC_SHA1_96: case ENCTYPE_AES256_CTS_HMAC_SHA1_96: - return context_derive_keys_new(ctx, gfp_mask); + ret = context_derive_keys_new(ctx, gfp_mask); + break; default: - return -EINVAL; + ret = -EINVAL; }

+ if (ret) { + p = ERR_PTR(ret); + goto out_free; + } + + return 0; + +out_free: + kfree(ctx->mech_used.data); out_err: return PTR_ERR(p); }