Showing error 770

User: Jiri Slaby
Error type: Invalid Pointer Dereference
Error type description: A pointer which is invalid is being dereferenced
File location: drivers/scsi/scsi_lib.c
Line in file: 2149
Project: Linux Kernel
Project version: 2.6.28
Tools: Stanse (1.2)
Entered: 2011-11-07 22:22:22 UTC

Source: 

2119 *        @sdev:        scsi device to change the state of.
2120 *        @timeout: command timeout
2121 *        @retries: number of retries before failing
2122 *        @sshdr_external: Optional pointer to struct scsi_sense_hdr for
2123 *                returning sense. Make sure that this is cleared before passing
2124 *                in.
2125 *
2126 *        Returns zero if unsuccessful or an error if TUR failed.  For
2127 *        removable media, a return of NOT_READY or UNIT_ATTENTION is
2128 *        translated to success, with the ->changed flag updated.
2129 **/
2130int
2131scsi_test_unit_ready(struct scsi_device *sdev, int timeout, int retries,
2132                     struct scsi_sense_hdr *sshdr_external)
2133{
2134        char cmd[] = {
2135                TEST_UNIT_READY, 0, 0, 0, 0, 0,
2136        };
2137        struct scsi_sense_hdr *sshdr;
2138        int result;
2139
2140        if (!sshdr_external)
2141                sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
2142        else
2143                sshdr = sshdr_external;
2144
2145        /* try to eat the UNIT_ATTENTION if there are enough retries */
2146        do {
2147                result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 0, sshdr,
2148                                          timeout, retries);
2149                if (sdev->removable && scsi_sense_valid(sshdr) &&
2150                    sshdr->sense_key == UNIT_ATTENTION)
2151                        sdev->changed = 1;
2152        } while (scsi_sense_valid(sshdr) &&
2153                 sshdr->sense_key == UNIT_ATTENTION && --retries);
2154
2155        if (!sshdr)
2156                /* could not allocate sense buffer, so can't process it */
2157                return result;
2158
2159        if (sdev->removable && scsi_sense_valid(sshdr) &&
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