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Tue, 23 Jun 2026 19:14:57 +0000 (GMT) Received: from ltcrain4-lp15.ltc.tadn.ibm.com (unknown [9.5.7.39]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 23 Jun 2026 19:14:57 +0000 (GMT) From: adubey@linux.ibm.com To: bpf@vger.kernel.org Cc: hbathini@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, maddy@linux.ibm.com, ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net, shuah@kernel.org, linux-kselftest@vger.kernel.org, stable@vger.kernel.org, Abhishek Dubey , sashiko-bot@kernel.org Subject: [PATCH bpf v9 8/8] powerpc64/bpf: fix percpu private stack leak on JIT failure Date: Tue, 23 Jun 2026 19:14:11 -0400 Message-ID: <20260623231411.6216-9-adubey@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260623231411.6216-1-adubey@linux.ibm.com> References: <20260623231411.6216-1-adubey@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Oph/DS/t c=1 sm=1 tr=0 ts=6a3adb38 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=SJ-jtujo7bo76xSWeacA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjIzMDE1NSBTYWx0ZWRfX2H5XoMx5nWWJ m62y6PksTNZin6rBCXi4c4pjygPixUARVgoOqwR3VF7zW3wI5yBplclQj4b0EwkRY2eZGweylvn dtAWAUAfAqsiRhov16M/8Bbw6oC9V3DGtAuyHOWE268Lr6ubQJssDKkduo4ftMIrNUV2QkJmz8K ybL2qODKGrMCS3rLeyCjtvxdbjeewG+EL6Kgs2RhI2tEco/0uZ1EZmDqpqiYs5NldkwL7n2AOQM L8NuJvDTjER13EFCi0f8qLmZ4CG/b6MyxGJKswqh3O5FEPoDMEsqC9yzndbWg0xVZff4pzaAlwm icr0ymb7L7trZ4R5KWzMCIu0AvqQ5TP+kAxIGAbD+um9AybOLCZazhwz0YiH4Km6oOtJaPEP9SL E+hwHvAeeGyLlQjJwvzieeek+VKvpw== X-Proofpoint-GUID: xAJjT9n7SPaDfVV7uNdzhCqfg5IRru91 X-Proofpoint-Spam-Info: AW1haW4tMjYwNjIzMDE1NSBTYWx0ZWRfX3BkofGrn1xk0 y2+igvHcNP931PcZu3rd5wgnN1/vOcVXxACR5vzKNepuPl30q19sNDDH+s8hhfq7gAOJ5mRJroJ wmBW+AvQOcrJxV2fBIJOoEjhzdNGSek= X-Proofpoint-ORIG-GUID: xAJjT9n7SPaDfVV7uNdzhCqfg5IRru91 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-23_03,2026-06-23_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 lowpriorityscore=0 bulkscore=0 spamscore=0 suspectscore=0 malwarescore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606230155 From: Abhishek Dubey The existing conditional statement in bpf_int_jit_compile() frees the percpu private stack at out_addrs only when the image buffer was never allocated. If bpf_jit_build_body() fails during a code-generation pass, the image buffer has already been allocated, so !image is false and the percpu stack is not freed. Because JIT compilation failed, fp->jited remains at 0. The subsequent bpf_jit_free() path only frees priv_stack_ptr when fp->jited is set, so freeing is skipped here too, leaking the percpu allocation. Fix implements freeing the private stack whenever fp->jited was not set, i.e. compilation did not succeed, instead of keying off !image. !fp->jited already covers the !image case, since image is only NULL on early-failure paths where fp->jited is likewise 0. Reported-by: sashiko-bot@kernel.org Closes: https://lore.kernel.org/bpf/20260616135426.A06B71F000E9@smtp.kernel.org Fixes: 156d985123b6 ("powerpc64/bpf: Implement JIT support for private stack") Cc: stable@vger.kernel.org Signed-off-by: Abhishek Dubey --- arch/powerpc/net/bpf_jit_comp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index 171cb6017259..46bbfb6be613 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -403,7 +403,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_verifier_env *env, struct bpf_pr (void *)fimage + FUNCTION_DESCR_SIZE); out_addrs: - if (!image && priv_stack_ptr) { + if (!fp->jited && priv_stack_ptr) { fp->aux->priv_stack_ptr = NULL; free_percpu(priv_stack_ptr); } -- 2.52.0