From 8682ff696050584cfcb5bf43d567680ad339cf41 Mon Sep 17 00:00:00 2001 From: Lev Kujawski Date: Mon, 10 Oct 2022 08:52:28 +0000 Subject: [PATCH] hw/ide/core.c (cmd_read_native_max): Avoid limited device parameters Always use the native CHS device parameters for the ATA commands READ NATIVE MAX ADDRESS and READ NATIVE MAX ADDRESS EXT, not those limited by the ATA command INITIALIZE_DEVICE_PARAMETERS (introduced in patch 176e4961, hw/ide/core.c: Implement ATA INITIALIZE_DEVICE_PARAMETERS command, 2022-07-07.) As stated by the ATA/ATAPI specification, "[t]he native maximum is the highest address accepted by the device in the factory default condition." Therefore this patch substitutes the native values in drive_heads and drive_sectors before calling ide_set_sector(). One consequence of the prior behavior was that setting zero sectors per track could lead to an FPE within ide_set_sector(). Thanks to Alexander Bulekov for reporting this issue. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1243 Signed-off-by: Lev Kujawski Message-ID: <20221010085229.2431276-1-lkujaw@mailbox.org> Signed-off-by: Thomas Huth --- hw/ide/core.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/hw/ide/core.c b/hw/ide/core.c index e8cb2dac92..08d9218455 100644 --- a/hw/ide/core.c +++ b/hw/ide/core.c @@ -1623,11 +1623,24 @@ static bool cmd_read_native_max(IDEState *s, uint8_t cmd) /* Refuse if no sectors are addressable (e.g. medium not inserted) */ if (s->nb_sectors == 0) { ide_abort_command(s); - return true; - } + } else { + /* + * Save the active drive parameters, which may have been + * limited from their native counterparts by, e.g., INITIALIZE + * DEVICE PARAMETERS or SET MAX ADDRESS. + */ + const int aheads = s->heads; + const int asectors = s->sectors; - ide_cmd_lba48_transform(s, lba48); - ide_set_sector(s, s->nb_sectors - 1); + s->heads = s->drive_heads; + s->sectors = s->drive_sectors; + + ide_cmd_lba48_transform(s, lba48); + ide_set_sector(s, s->nb_sectors - 1); + + s->heads = aheads; + s->sectors = asectors; + } return true; }