This is a note to let you know that I've just added the patch titled mmc: sdio: Check for CISTPL_VERS_1 buffer size to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mmc-sdio-check-for-cistpl_vers_1-buffer-size.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit bb860952def0e697f1c0a15635de536a45e5cc60 Author: Pali Rohár <pali@xxxxxxxxxx> Date: Mon Jul 27 15:38:34 2020 +0200 mmc: sdio: Check for CISTPL_VERS_1 buffer size [ Upstream commit 8ebe2607965d3e2dc02029e8c7dd35fbe508ffd0 ] Before parsing CISTPL_VERS_1 structure check that its size is at least two bytes to prevent buffer overflow. Signed-off-by: Pali Rohár <pali@xxxxxxxxxx> Link: https://lore.kernel.org/r/20200727133837.19086-2-pali@xxxxxxxxxx Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/mmc/core/sdio_cis.c b/drivers/mmc/core/sdio_cis.c index 8e94e555b788d..8651bd30863d4 100644 --- a/drivers/mmc/core/sdio_cis.c +++ b/drivers/mmc/core/sdio_cis.c @@ -30,6 +30,9 @@ static int cistpl_vers_1(struct mmc_card *card, struct sdio_func *func, unsigned i, nr_strings; char **buffer, *string; + if (size < 2) + return 0; + /* Find all null-terminated (including zero length) strings in the TPLLV1_INFO field. Trailing garbage is ignored. */ buf += 2;