[PATCH v2 01/30] scsi: aacraid: Fix udev inquiry race condition

[Raghava Aditya Renukunta]

When udev requests for a devices inquiry string, it might create multiple
threads causing a race condition on the shared inquiry resource string.

Created a buffer with the string for each thread.

Cc: <sta...@vger.kernel.org>
Fixes: 3bc8070fb75b3315 ([SCSI] aacraid: SMC vendor identification)
Signed-off-by: Raghava Aditya Renukunta <raghavaaditya.renuku...@microsemi.com>

---
Changes in V2:
Replaced kmalloc and memcpy adapter_type_text with kmemdup

 drivers/scsi/aacraid/aachba.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index af3e4d3..548a3e7 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -913,8 +913,16 @@ static void setinqstr(struct aac_dev *dev, void *data, int 
tindex)
        memset(str, ' ', sizeof(*str));
 
        if (sup_adap_info->adapter_type_text[0]) {
-               char *cp = sup_adap_info->adapter_type_text;
                int c;
+               char *cp;
+               char *cname = kmemdup(sup_adap_info->adapter_type_text,
+                               sizeof(sup_adap_info->adapter_type_text),
+                                                               GFP_ATOMIC);
+
+               if (!cname)
+                       return;
+
+               cp = cname;
                if ((cp[0] == 'A') && (cp[1] == 'O') && (cp[2] == 'C'))
                        inqstrcpy("SMC", str->vid);
                else {
@@ -923,7 +931,7 @@ static void setinqstr(struct aac_dev *dev, void *data, int 
tindex)
                                ++cp;
                        c = *cp;
                        *cp = '\0';
-                       inqstrcpy(sup_adap_info->adapter_type_text, str->vid);
+                       inqstrcpy(cname, str->vid);
                        *cp = c;
                        while (*cp && *cp != ' ')
                                ++cp;
@@ -937,8 +945,8 @@ static void setinqstr(struct aac_dev *dev, void *data, int 
tindex)
                        cp[sizeof(str->pid)] = '\0';
                }
                inqstrcpy (cp, str->pid);
-               if (c)
-                       cp[sizeof(str->pid)] = c;
+
+               kfree(cname);
        } else {
                struct aac_driver_ident *mp = 
aac_get_driver_ident(dev->cardtype);
 
-- 
2.9.4