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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::f29; envelope-from=chrisfriedt@gmail.com; helo=mail-qv1-xf29.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1665764370168100001 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)! Note: the original change (and error message) was when parameters were uint32_t. Signed-off-by: Chris Friedt Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1254 --- hw/misc/edu.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/hw/misc/edu.c b/hw/misc/edu.c index e935c418d4..a6f5f97f13 100644 --- a/hw/misc/edu.c +++ b/hw/misc/edu.c @@ -103,19 +103,18 @@ 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)) { + /* + * 1. ensure we aren't overflowing + * 2. ensure that [start, end2) is within [addr, end1) + */ + if (end1 >=3D addr && end2 >=3D start && start >=3D addr && end2 <=3D = end1) + { return; } =20 --=20 2.36.1