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| author | Stanislav Meduna <stano@meduna.org> | 2016-05-02 16:05:11 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-05-11 11:21:38 +0200 |
| commit | 61a33e0e3a51e43c5b3970c6f2dadb5ef14c61ed (patch) | |
| tree | 8bf8e7abc04066c6f906cf7c1711ac0277429105 | |
| parent | dc19120c1cfd7bc8ae59776ad9f48ffdf37d7c7d (diff) | |
| download | lwn-61a33e0e3a51e43c5b3970c6f2dadb5ef14c61ed.tar.gz lwn-61a33e0e3a51e43c5b3970c6f2dadb5ef14c61ed.zip | |
nvmem: mxs-ocotp: fix buffer overflow in read
commit d1306eb675ad7a9a760b6b8e8e189824b8db89e7 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: c01e9a11ab6f ("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>
| -rw-r--r-- | drivers/nvmem/mxs-ocotp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/nvmem/mxs-ocotp.c b/drivers/nvmem/mxs-ocotp.c index 8ba19bba3156..2bb3c5799ac4 100644 --- a/drivers/nvmem/mxs-ocotp.c +++ b/drivers/nvmem/mxs-ocotp.c @@ -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; } |