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thunderbolt: debugfs: Fix sideband write size check

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sb_regs_write() looks up the matching sideband register entry before
validating the number of bytes to write.

However, the size check uses sb_regs->size, which is the size of the
first entry in the register table, instead of the matched entry. This
rejects valid writes to larger sideband registers such as USB4_SB_DEBUG
or USB4_SB_DATA.

Use the matched register entry for the size check.

Signed-off-by: Xu Rao <raoxu@uniontech.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Xu Rao 2026-06-08 14:31:47 +08:00 committed by Mika Westerberg
parent 503c5ae1e7
commit c1bef05763
1 changed files with 1 additions and 1 deletions
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2
drivers/thunderbolt/debugfs.c
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@ -366,7 +366,7 @@ static ssize_t sb_regs_write(struct tb_port *port, const struct sb_reg *sb_regs,
if (!sb_reg)
return -EINVAL;
if (bytes_read > sb_regs->size)
if (bytes_read > sb_reg->size)
return -E2BIG;
ret = usb4_port_sb_write(port, target, index, sb_reg->reg, data,