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scsi: scsi_debug: Fix one-partition tape setup bounds

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The tape setup path uses one tape_block entry as the end-of-data marker
after the usable tape blocks. For the one-partition layout, partition 0
uses all TAPE_UNITS data slots and partition 1's marker is written at
tape_blocks[0] + TAPE_UNITS.

Only TAPE_UNITS entries are allocated, so that marker write is one
element past the allocation during device initialization before any
command is issued.

Allocate one extra tape_block entry for the marker. This keeps the
existing partitioning paths unchanged while providing backing storage
for the sentinel.

Assisted-by: Codex:gpt-5.5-cyber-preview
Signed-off-by: Samuel Moelius <sam.moelius@trailofbits.com>
Reviewed-by: Kai Mäkisara <Kai.Makisara@kolumbus.fi>
Link: https://patch.msgid.link/20260604234724.1936118-1-sam.moelius@trailofbits.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Samuel Moelius 2026-06-04 23:43:56 +00:00 committed by Martin K. Petersen
parent 63977ab3c6
commit 3c08f6034d
1 changed files with 1 additions and 1 deletions
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2
drivers/scsi/scsi_debug.c
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@ -6640,7 +6640,7 @@ static int scsi_debug_sdev_configure(struct scsi_device *sdp,
if (sdebug_ptype == TYPE_TAPE) {
if (!devip->tape_blocks[0]) {
devip->tape_blocks[0] =
kzalloc_objs(struct tape_block, TAPE_UNITS);
kzalloc_objs(struct tape_block, TAPE_UNITS + 1);
if (!devip->tape_blocks[0])
return 1;
}