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[S390] dasd: fix use after free in dbf 

Writing to /proc/dasd/statistics while the debug level of the
generic dasd debug entry is set to DBF_DEBUG will lead to an
use after free when accessing the debug entry later.
Since for the format string "%s" in the s390 dbf only a pointer
to the string is stored in the debug feature and the buffer used
here is freed afterwards.

To fix this just remove the debug message.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2010-10-25 16:10:46 +02:00 committed by Martin Schwidefsky
parent e05ef9bdb8
commit 26cffecf84
1 changed files with 0 additions and 1 deletions
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1
drivers/s390/block/dasd_proc.c
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@ -251,7 +251,6 @@ static ssize_t dasd_stats_proc_write(struct file *file,
buffer = dasd_get_user_string(user_buf, user_len); buffer = dasd_get_user_string(user_buf, user_len);
if (IS_ERR(buffer)) if (IS_ERR(buffer))
return PTR_ERR(buffer); return PTR_ERR(buffer);
DBF_EVENT(DBF_DEBUG, "/proc/dasd/statictics: '%s'\n", buffer);
/* check for valid verbs */ /* check for valid verbs */
str = skip_spaces(buffer); str = skip_spaces(buffer);