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mmc: davinci_mmc: Prevent transmitted data size from exceeding sgm's length

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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@vger.kernel.org
Fixes: ed01d210fd ("mmc: davinci_mmc: Use sg_miter for PIO")
Signed-off-by: Bastien Curutchet <bastien.curutchet@bootlin.com>
Link: https://lore.kernel.org/r/20240711081838.47256-2-bastien.curutchet@bootlin.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Bastien Curutchet 2024-07-11 10:18:37 +02:00 committed by Ulf Hansson
parent 63d20a94f2
commit 16198eef11
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/host/davinci_mmc.c
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@ -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