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lib: Fix a memory leak in scsi_cdb_persistent_reserve_out()

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If scsi_cdb_persistent_reserve_out() succeeds a call to
scsi_free_scsi_task() won't free any memory allocated with scsi_malloc()
in this function because the memset() call in this function overwrites
the task->mem pointer. Move the memset() call up such that it doesn't
clear task->mem. This makes it possible for the caller of this function
to free the memory allocated by this function by calling
scsi_free_scsi_task(). Merge the error handling code such that the code
for freeing memory only occurs once.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
This commit is contained in:
Bart Van Assche
2013-10-20 14:33:48 +02:00
committed by Ronnie Sahlberg
parent afa076b537
commit 3fdc3f2327
1 changed files with 15 additions and 22 deletions
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37
lib/scsi-lowlevel.c
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@@ -2037,15 +2037,14 @@ scsi_cdb_persistent_reserve_out(enum scsi_persistent_out_sa sa, enum scsi_persis
int xferlen;
task = malloc(sizeof(struct scsi_task));
if (task == NULL) {
return NULL;
}
if (task == NULL)
goto err;
memset(task, 0, sizeof(struct scsi_task));
iov = scsi_malloc(task, sizeof(struct scsi_iovec));
if (iov == NULL) {
free(task);
return NULL;
}
if (iov == NULL)
goto err;
switch(sa) {
case SCSI_PERSISTENT_RESERVE_REGISTER:
@@ -2059,11 +2058,8 @@ scsi_cdb_persistent_reserve_out(enum scsi_persistent_out_sa sa, enum scsi_persis
xferlen = 24;
buf = scsi_malloc(task, xferlen);
if (buf == NULL) {
free(task);
free(iov);
return NULL;
}
if (buf == NULL)
goto err;
memset(buf, 0, xferlen);
scsi_set_uint64(&buf[0], basic->reservation_key);
@@ -2080,19 +2076,12 @@ scsi_cdb_persistent_reserve_out(enum scsi_persistent_out_sa sa, enum scsi_persis
break;
case SCSI_PERSISTENT_RESERVE_REGISTER_AND_MOVE:
/* XXX FIXME */
free(task);
free(iov);
return NULL;
goto err;
default:
free(task);
free(iov);
return NULL;
goto err;
}
memset(task, 0, sizeof(struct scsi_task));
task->cdb[0] = SCSI_OPCODE_PERSISTENT_RESERVE_OUT;
task->cdb[0] = SCSI_OPCODE_PERSISTENT_RESERVE_OUT;
task->cdb[1] |= sa & 0x1f;
task->cdb[2] = ((scope << 4) & 0xf0) | (type & 0x0f);
@@ -2107,6 +2096,10 @@ scsi_cdb_persistent_reserve_out(enum scsi_persistent_out_sa sa, enum scsi_persis
scsi_task_set_iov_out(task, iov, 1);
return task;
err:
scsi_free_scsi_task(task);
return NULL;
}
/*