From: Bastien Curutchet <bastien.curutchet@xxxxxxxxxxx>
commit 16198eef11c1929374381d7f6271b4bf6aa44615 upstream.
No check is done on the size of the data to be transmiited. This causes
a kernel panic when this size exceeds the sg_miter's length.
Limit the number of transmitted bytes to sgm->length.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: ed01d210fd91 ("mmc: davinci_mmc: Use sg_miter for PIO")
Signed-off-by: Bastien Curutchet <bastien.curutchet@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240711081838.47256-2-bastien.curutchet@xxxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/davinci_mmc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index d7427894e0bc..c302eb380e42 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -224,6 +224,9 @@ static void davinci_fifo_data_trans(struct mmc_davinci_host *host,
}
p = sgm->addr;
+ if (n > sgm->length)
+ n = sgm->length;
+
/* NOTE: we never transfer more than rw_threshold bytes
* to/from the fifo here; there's no I/O overlap.
* This also assumes that access width( i.e. ACCWD) is 4 bytes
--
2.45.2
Patches currently in stable-queue which might be from bastien.curutchet@xxxxxxxxxxx are
queue-6.9/mmc-davinci_mmc-prevent-transmitted-data-size-from-exceeding-sgm-s-length.patch
