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([192.228.203.229]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-682227f1838sm4021368a12.46.2024.05.26.02.56.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 26 May 2024 02:56:38 -0700 (PDT) From: Amjad Alsharafi To: qemu-devel@nongnu.org Cc: Hanna Reitz , Kevin Wolf , "open list:vvfat" , Amjad Alsharafi Subject: [PATCH v3 1/6] vvfat: Fix bug in writing to middle of file Date: Sun, 26 May 2024 17:56:01 +0800 Message-ID: <2871281d8ea41fb4d7ef8f9beeaba017a1717019.1716717181.git.amjadsharafi10@gmail.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::32b; envelope-from=amjadsharafi10@gmail.com; helo=mail-ot1-x32b.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 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_ENVFROM_END_DIGIT=0.25, 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Before this commit, the behavior when calling `commit_one_file` for example with `offset=0x2000` (second cluster), what will happen is that we won't fetch the next cluster from the fat, and instead use the first cluster for the read operation. This is due to off-by-one error here, where `i=0x2000 !< offset=0x2000`, thus not fetching the next cluster. Signed-off-by: Amjad Alsharafi Reviewed-by: Kevin Wolf Tested-by: Kevin Wolf --- block/vvfat.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/vvfat.c b/block/vvfat.c index 9d050ba3ae..ab342f0743 100644 --- a/block/vvfat.c +++ b/block/vvfat.c @@ -2525,7 +2525,7 @@ commit_one_file(BDRVVVFATState* s, int dir_index, uint32_t offset) return -1; } - for (i = s->cluster_size; i < offset; i += s->cluster_size) + for (i = s->cluster_size; i <= offset; i += s->cluster_size) c = modified_fat_get(s, c); fd = qemu_open_old(mapping->path, O_RDWR | O_CREAT | O_BINARY, 0666);