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usb: potential integer overflow in usbg_make_tpg()

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[ Upstream commit 153874010354d050f62f8ae25cbb960c17633dc5 ]

The variable tpgt in usbg_make_tpg() is defined as unsigned long and is
assigned to tpgt->tport_tpgt, which is defined as u16. This may cause an
integer overflow when tpgt is greater than USHRT_MAX (65535). I
haven't tried to trigger it myself, but it is possible to trigger it
by calling usbg_make_tpg() with a large value for tpgt.

I modified the type of tpgt to match tpgt->tport_tpgt and adjusted the
relevant code accordingly.

This patch is similar to commit 59c816c1f2 ("vhost/scsi: potential
memory corruption").

Signed-off-by: Chen Yufeng <chenyufeng@iie.ac.cn>
Link: https://lore.kernel.org/r/20250415065857.1619-1-chenyufeng@iie.ac.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chen Yufeng
2025-04-15 14:58:57 +08:00
committed by Greg Kroah-Hartman
parent a8d1b4f219
commit a33f507f36
1 changed files with 2 additions and 2 deletions
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4
drivers/usb/gadget/function/f_tcm.c
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@@ -1297,14 +1297,14 @@ static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn,
struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
tport_wwn);
struct usbg_tpg *tpg;
unsigned long tpgt;
u16 tpgt;
int ret;
struct f_tcm_opts *opts;
unsigned i;
if (strstr(name, "tpgt_") != name)
return ERR_PTR(-EINVAL);
if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
if (kstrtou16(name + 5, 0, &tpgt))
return ERR_PTR(-EINVAL);
ret = -ENODEV;
mutex_lock(&tpg_instances_lock);