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nvmem: mxs-ocotp: fix buffer overflow in read

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commit d1306eb675 upstream.

This patch fixes the issue where the mxs_ocotp_read is reading
the ocotp in reg_size steps but decrements the remaining size
by 1. The number of iterations is thus four times higher,
overwriting the area behind the output buffer.

Fixes: c01e9a11ab ("nvmem: add driver for ocotp in i.MX23 and i.MX28")
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Stanislav Meduna <stano@meduna.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stanislav Meduna 2016-05-02 16:05:11 +01:00 committed by Greg Kroah-Hartman
parent e5dd50f572
commit 6e9544fb23
1 changed files with 2 additions and 2 deletions
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4
drivers/nvmem/mxs-ocotp.c
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@ -94,7 +94,7 @@ static int mxs_ocotp_read(void *context, const void *reg, size_t reg_size,
if (ret)
goto close_banks;
while (val_size) {
while (val_size >= reg_size) {
if ((offset < OCOTP_DATA_OFFSET) || (offset % 16)) {
/* fill up non-data register */
*buf = 0;
@ -103,7 +103,7 @@ static int mxs_ocotp_read(void *context, const void *reg, size_t reg_size,
}
buf++;
val_size--;
val_size -= reg_size;
offset += reg_size;
}