diff options
| author | Tianchu Chen <flynnnchen@tencent.com> | 2025-11-16 12:46:18 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-12-07 06:08:23 +0900 |
| commit | d00a6c04a502cd52425dbf35588732c652b16490 (patch) | |
| tree | cf31004ef0a77d0df2c7aa34f5e75e3ebc0ffb99 | |
| parent | 3cd5f4b421aec93708ba7c1fcbbff74366e28fdd (diff) | |
usb: storage: sddr55: Reject out-of-bound new_pba
commit b59d4fda7e7d0aff1043a7f742487cb829f5aac1 upstream.
Discovered by Atuin - Automated Vulnerability Discovery Engine.
new_pba comes from the status packet returned after each write.
A bogus device could report values beyond the block count derived
from info->capacity, letting the driver walk off the end of
pba_to_lba[] and corrupt heap memory.
Reject PBAs that exceed the computed block count and fail the
transfer so we avoid touching out-of-range mapping entries.
Signed-off-by: Tianchu Chen <flynnnchen@tencent.com>
Cc: stable <stable@kernel.org>
Link: https://patch.msgid.link/B2DC73A3EE1E3A1D+202511161322001664687@tencent.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/storage/sddr55.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/storage/sddr55.c b/drivers/usb/storage/sddr55.c index 15dc25801cdc..f53b2471a21c 100644 --- a/drivers/usb/storage/sddr55.c +++ b/drivers/usb/storage/sddr55.c @@ -469,6 +469,12 @@ static int sddr55_write_data(struct us_data *us, new_pba = (status[3] + (status[4] << 8) + (status[5] << 16)) >> info->blockshift; + /* check if device-reported new_pba is out of range */ + if (new_pba >= (info->capacity >> (info->blockshift + info->pageshift))) { + result = USB_STOR_TRANSPORT_FAILED; + goto leave; + } + /* check status for error */ if (status[0] == 0xff && status[1] == 0x4) { info->pba_to_lba[new_pba] = BAD_BLOCK; |