[openssl/openssl] 5ff021: rsa_sig: reject short buffers in raw verify_recover

  Branch: refs/heads/openssl-3.0
  Home:   https://github.com/openssl/openssl
  Commit: 5ff02168091fb20b6e4655bc545b7d6b5e3164cd
      https://github.com/openssl/openssl/commit/5ff02168091fb20b6e4655bc545b7d6b5e3164cd
  Author: rootvector2 <[email protected]>
  Date:   2026-06-02 (Tue, 02 Jun 2026)

  Changed paths:
    M providers/implementations/signature/rsa_sig.c

  Log Message:
  -----------
  rsa_sig: reject short buffers in raw verify_recover

The md==NULL path of rsa_verify_recover passed the caller buffer to
RSA_public_decrypt without checking routsize, while the X9.31 and PKCS#1
paths already reject undersized output buffers. RSA_public_decrypt writes
up to RSA_size() bytes, so a short rout overflows. Validate routsize
against RSA_size() before the call.

Fixes: 6f4b7663150e "PROV: add RSA signature implementation"

Reviewed-by: Tomas Mraz <[email protected]>
Reviewed-by: Dmitry Belyavskiy <[email protected]>
Reviewed-by: Eugene Syromiatnikov <[email protected]>
Reviewed-by: Paul Yang <[email protected]>
MergeDate: Tue Jun  2 11:55:00 2026
(Merged from https://github.com/openssl/openssl/pull/31340)

(cherry picked from commit 78dd79823215ff37a51d977b47cf0bcb4798cee2)
(cherry picked from commit 317a8867ce00ab2ec7b9652531b3338bbf9cd5ff)



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