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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::72c; envelope-from=chrisfriedt@gmail.com; helo=mail-qk1-x72c.google.com X-Spam_score_int: -12 X-Spam_score: -1.3 X-Spam_bar: - X-Spam_report: (-1.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-trivial@nongnu.org, Christopher Friedt Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1641695973618100001 Content-Type: text/plain; charset="utf-8" In the case that size1 was zero, because of the explicit 'end1 > addr' check, the range check would fail and the error message would read as shown below. The correct comparison is 'end1 >=3D addr' (or 'addr <=3D end1'). EDU: DMA range 0x40000-0x3ffff out of bounds (0x40000-0x3ffff)! At the opposite end, in the case that size1 was 4096, within() would fail because of the non-inclusive check 'end1 < end2', which should have been 'end1 <=3D end2'. The error message would previously say EDU: DMA range 0x40000-0x40fff out of bounds (0x40000-0x40fff)! The solution is to use non-inclusive ranges e.g. [begin,end). Signed-off-by: Christopher Friedt --- hw/misc/edu.c | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-) diff --git a/hw/misc/edu.c b/hw/misc/edu.c index e935c418d4..73e97a54e7 100644 --- a/hw/misc/edu.c +++ b/hw/misc/edu.c @@ -103,25 +103,21 @@ static void edu_lower_irq(EduState *edu, uint32_t val) } } =20 -static bool within(uint64_t addr, uint64_t start, uint64_t end) -{ - return start <=3D addr && addr < end; -} - static void edu_check_range(uint64_t addr, uint64_t size1, uint64_t start, uint64_t size2) { uint64_t end1 =3D addr + size1; uint64_t end2 =3D start + size2; =20 - if (within(addr, start, end2) && - end1 > addr && within(end1, start, end2)) { + if (start <=3D addr && addr < end2 && + addr <=3D end1 && + start <=3D end1 && end1 <=3D end2) { return; } =20 - hw_error("EDU: DMA range 0x%016"PRIx64"-0x%016"PRIx64 - " out of bounds (0x%016"PRIx64"-0x%016"PRIx64")!", - addr, end1 - 1, start, end2 - 1); + hw_error("EDU: DMA range [0x%016"PRIx64", 0x%016"PRIx64")" + " out of bounds [0x%016"PRIx64", 0x%016"PRIx64")!", + addr, end1, start, end2); } =20 static dma_addr_t edu_clamp_addr(const EduState *edu, dma_addr_t addr) --=20 2.30.2