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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260327-fix_dma_fence_chain_find_seqno-v1-1-60e80bfb43c8@zohomail.com> X-B4-Tracking: v=1; b=H4sIACeVxmkC/x2NQQqEMBAEvyJz3kCMi4JfERmC6ezOwVETWATx7 w57LOjquqiiCCqNzUUFP6myqUH7amj5Rv3ASTKm4EPvuzC4LCenNXKGLmDbiHIWTVxx6OaGmBD 7NzJ8S3ayF5jxD0zzfT/Zd5u7cAAAAA== X-Change-ID: 20260327-fix_dma_fence_chain_find_seqno-7adea64efe01 To: Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= , Lionel Landwerlin Cc: =?utf-8?q?Christian_K=C3=B6nig?= , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, Li Ming X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1774621995; l=1233; i=ming.li@zohomail.com; s=20260210; h=from:subject:message-id; bh=+zLhFjmQDcbbt7AWjLmj5y51IOac2tCxLouPPcLnI8s=; b=n+W96xE4botpec3dm4ZtmEfoa2crfqwYysFYGgIGPd40VUnYgxh6GUDVRA02g7GKPnyDIfZ3a px4khNDWLaaBfqUeciHdC5QYk3tNhwpvOgC0sEslcxLi0Jq0gaKY6Al X-Developer-Key: i=ming.li@zohomail.com; a=ed25519; pk=JfhrdHjyYJMXt47Hy8d/fsqZuhGPD4Z3whV5lTfVvhE= Feedback-ID: rr08011228940aa66380fa0d4b662a568400000d279bad22d5095ea3e85f9414054fc86fffc237db77815a9796:zu08011227ab6f83bf04d1505dc422a3a70000adc505029736d0771b9faea9619460ca47f63293d14ccafe3a:rf0801122d88732d6b5a5151da13656a3e00007c881f111584b5d382ba029be96c8375f169bebdf57c1d7ad2c58728b9fa40:ZohoMail X-ZohoMailClient: External dma_fence_chain_find_seqno() uses dma_fence_chain_for_each() to walk a given dma_fence_chain. dma_fence_chain_for_each() always holds a reference for the current fence during iteration. The reference must be dropped after breaking out. Instead of dereferencing the last fence as intended, dma_fence_chain_find_seqno() incorrectly dereferences the first fence in the chain. Fixes: 7bf60c52e093 ("dma-buf: add new dma_fence_chain container v7") Signed-off-by: Li Ming --- drivers/dma-buf/dma-fence-chain.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma-buf/dma-fence-chain.c b/drivers/dma-buf/dma-fence-= chain.c index a8a90acf4f34..71fa173aef13 100644 --- a/drivers/dma-buf/dma-fence-chain.c +++ b/drivers/dma-buf/dma-fence-chain.c @@ -103,7 +103,7 @@ int dma_fence_chain_find_seqno(struct dma_fence **pfenc= e, uint64_t seqno) to_dma_fence_chain(*pfence)->prev_seqno < seqno) break; } - dma_fence_put(&chain->base); + dma_fence_put(*pfence); =20 return 0; } --- base-commit: c369299895a591d96745d6492d4888259b004a9e change-id: 20260327-fix_dma_fence_chain_find_seqno-7adea64efe01 Best regards, --=20 Li Ming