libata: use ata_id_c_string()

There were several places where ATA ID strings are manually terminated
and in some places possibly unterminated strings were passed to string
functions which don't limit length like strstr().  This patch converts
all of them over to ata_id_c_string().

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

6 files changed, 23 insertions, 78 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 7d4b002568e7..a03019c40ac4 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -3325,35 +3325,20 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
         { }
 };
 
-static int ata_strim(char *s, size_t len)
-{
-        len = strnlen(s, len);
-
-        /* ATAPI specifies that empty space is blank-filled; remove blanks */
-        while ((len > 0) && (s[len - 1] == ' ')) {
-                len--;
-                s[len] = 0;
-        }
-        return len;
-}
-
 unsigned long ata_device_blacklisted(const struct ata_device *dev)
 {
-        unsigned char model_num[ATA_ID_PROD_LEN];
-        unsigned char model_rev[ATA_ID_FW_REV_LEN];
-        unsigned int nlen, rlen;
+        unsigned char model_num[ATA_ID_PROD_LEN + 1];
+        unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
         const struct ata_blacklist_entry *ad = ata_device_blacklist;
 
-        ata_id_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
-        ata_id_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
-        nlen = ata_strim(model_num, sizeof(model_num));
-        rlen = ata_strim(model_rev, sizeof(model_rev));
+        ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
+        ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
 
         while (ad->model_num) {
-                if (!strncmp(ad->model_num, model_num, nlen)) {
+                if (!strcmp(ad->model_num, model_num)) {
                         if (ad->model_rev == NULL)
                                 return ad->horkage;
-                        if (!strncmp(ad->model_rev, model_rev, rlen))
+                        if (!strcmp(ad->model_rev, model_rev))
                                 return ad->horkage;
                 }
                 ad++;
diff --git a/drivers/ata/pata_ali.c b/drivers/ata/pata_ali.c
index 76e386043dcd..fde5ce9f7eae 100644
--- a/drivers/ata/pata_ali.c
+++ b/drivers/ata/pata_ali.c
@@ -153,11 +153,11 @@ static void ali_early_error_handler(struct ata_port *ap)
 
 static unsigned long ali_20_filter(const struct ata_port *ap, struct ata_device *adev, unsigned long mask)
 {
-        char model_num[ATA_ID_PROD_LEN];
+        char model_num[ATA_ID_PROD_LEN + 1];
         /* No DMA on anything but a disk for now */
         if (adev->class != ATA_DEV_ATA)
                 mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
-        ata_id_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));
+        ata_id_c_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));
         if (strstr(model_num, "WDC"))
                 return mask &= ~ATA_MASK_UDMA;
         return ata_pci_default_filter(ap, adev, mask);
diff --git a/drivers/ata/pata_hpt366.c b/drivers/ata/pata_hpt366.c
index 81deb2c3824c..2202c7ec16e3 100644
--- a/drivers/ata/pata_hpt366.c
+++ b/drivers/ata/pata_hpt366.c
@@ -151,23 +151,13 @@ static const char *bad_ata66_3[] = {
 
 static int hpt_dma_blacklisted(const struct ata_device *dev, char *modestr, const char *list[])
 {
-        unsigned char model_num[ATA_ID_PROD_LEN];
-        char *s;
-        unsigned int len;
+        unsigned char model_num[ATA_ID_PROD_LEN + 1];
         int i = 0;
 
-        ata_id_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
-        s = &model_num[0];
-        len = strnlen(s, sizeof(model_num));
+        ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
 
-        /* ATAPI specifies that empty space is blank-filled; remove blanks */
-        while ((len > 0) && (s[len - 1] == ' ')) {
-                len--;
-                s[len] = 0;
-        }
-
-        while(list[i] != NULL) {
-                if (!strncmp(list[i], s, len)) {
+        while (list[i] != NULL) {
+                if (!strcmp(list[i], model_num)) {
                         printk(KERN_WARNING DRV_NAME ": %s is not supported for %s.\n",
                                 modestr, list[i]);
                         return 1;
diff --git a/drivers/ata/pata_hpt37x.c b/drivers/ata/pata_hpt37x.c
index ff767755e98b..9e1eb473c0a1 100644
--- a/drivers/ata/pata_hpt37x.c
+++ b/drivers/ata/pata_hpt37x.c
@@ -349,23 +349,13 @@ static u32 hpt37x_find_mode(struct ata_port *ap, int speed)
 
 static int hpt_dma_blacklisted(const struct ata_device *dev, char *modestr, const char *list[])
 {
-        unsigned char model_num[ATA_ID_PROD_LEN];
-        char *s;
-        unsigned int len;
+        unsigned char model_num[ATA_ID_PROD_LEN + 1];
         int i = 0;
 
-        ata_id_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
-        s = &model_num[0];
-        len = strnlen(s, sizeof(model_num));
+        ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
 
-        /* ATAPI specifies that empty space is blank-filled; remove blanks */
-        while ((len > 0) && (s[len - 1] == ' ')) {
-                len--;
-                s[len] = 0;
-        }
-
-        while(list[i] != NULL) {
-                if (!strncmp(list[i], s, len)) {
+        while (list[i] != NULL) {
+                if (!strcmp(list[i], model_num)) {
                         printk(KERN_WARNING DRV_NAME ": %s is not supported for %s.\n",
                                 modestr, list[i]);
                         return 1;
diff --git a/drivers/ata/pata_it821x.c b/drivers/ata/pata_it821x.c
index c84dfaede89c..171fbd206bd5 100644
--- a/drivers/ata/pata_it821x.c
+++ b/drivers/ata/pata_it821x.c
@@ -531,22 +531,9 @@ static int it821x_smart_set_mode(struct ata_port *ap, struct ata_device **unused
 
 static void it821x_dev_config(struct ata_port *ap, struct ata_device *adev)
 {
-        unsigned char model_num[ATA_ID_PROD_LEN];
-        char *s;
-        unsigned int len;
+        unsigned char model_num[ATA_ID_PROD_LEN + 1];
 
-        /* This block ought to be a library routine as it is in several
-           drivers now */
-
-        ata_id_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));
-        s = &model_num[0];
-        len = strnlen(s, sizeof(model_num));
-
-        /* ATAPI specifies that empty space is blank-filled; remove blanks */
-        while ((len > 0) && (s[len - 1] == ' ')) {
-                len--;
-                s[len] = 0;
-        }
+        ata_id_c_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));
 
         if (adev->max_sectors > 255)
                 adev->max_sectors = 255;
diff --git a/drivers/ata/pata_serverworks.c b/drivers/ata/pata_serverworks.c
index bf9452728d19..4b8c2352cdca 100644
--- a/drivers/ata/pata_serverworks.c
+++ b/drivers/ata/pata_serverworks.c
@@ -218,25 +218,18 @@ static unsigned long serverworks_osb4_filter(const struct ata_port *ap, struct a
 static unsigned long serverworks_csb_filter(const struct ata_port *ap, struct ata_device *adev, unsigned long mask)
 {
         const char *p;
-        char model_num[ATA_ID_PROD_LEN];
-        int len, i;
+        char model_num[ATA_ID_PROD_LEN + 1];
+        int i;
 
         /* Disk, UDMA */
         if (adev->class != ATA_DEV_ATA)
                 return ata_pci_default_filter(ap, adev, mask);
 
         /* Actually do need to check */
-        ata_id_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));
-        /* Precuationary - why not do this in the libata core ?? */
+        ata_id_c_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));
 
-        len = strlen(model_num);
-        while ((len > 0) && (model_num[len - 1] == ' ')) {
-                len--;
-                model_num[len] = 0;
-        }
-
-        for(i = 0; (p = csb_bad_ata100[i]) != NULL; i++) {
-                if (!strncmp(p, model_num, len))
+        for (i = 0; (p = csb_bad_ata100[i]) != NULL; i++) {
+                if (!strcmp(p, model_num))
                         mask &= ~(0x1F << ATA_SHIFT_UDMA);
         }
         return ata_pci_default_filter(ap, adev, mask);