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| author | Harry Zhang <harry.zhang@amd.com> | 2010-06-24 11:34:23 +0800 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2010-07-01 15:34:15 -0400 |
| commit | f9ce889b8f8384ee29e1be4b34091a932e6e40f3 (patch) | |
| tree | ed9b189cf639e2dcfa144cd840c0e0efa55f838a /drivers/ata/libahci.c | |
| parent | 984bc9601f64fd341b8573021d7c999f1f1499a9 (diff) | |
| download | lwn-f9ce889b8f8384ee29e1be4b34091a932e6e40f3.tar.gz lwn-f9ce889b8f8384ee29e1be4b34091a932e6e40f3.zip | |
libahci: Fix bug in storing EM messages
In function ahci_store_em_buffer(), if the input (signed char*) buffer
contains negative data, the constructed 32-bit long message data may
be wrong.
Signed-off-by: Harry Zhang <harry.zhang@amd.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/libahci.c')
| -rw-r--r-- | drivers/ata/libahci.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index 261f86d102e8..81e772a94d59 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -324,6 +324,7 @@ static ssize_t ahci_store_em_buffer(struct device *dev, struct ahci_host_priv *hpriv = ap->host->private_data; void __iomem *mmio = hpriv->mmio; void __iomem *em_mmio = mmio + hpriv->em_loc; + const unsigned char *msg_buf = buf; u32 em_ctl, msg; unsigned long flags; int i; @@ -343,8 +344,8 @@ static ssize_t ahci_store_em_buffer(struct device *dev, } for (i = 0; i < size; i += 4) { - msg = buf[i] | buf[i + 1] << 8 | - buf[i + 2] << 16 | buf[i + 3] << 24; + msg = msg_buf[i] | msg_buf[i + 1] << 8 | + msg_buf[i + 2] << 16 | msg_buf[i + 3] << 24; writel(msg, em_mmio + i); } |