diff options
| author | Dan Carpenter <error27@gmail.com> | 2010-09-29 10:41:05 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-09-30 09:11:27 +0200 |
| commit | b365a85c68161ea5db5476eb8845a91ceb1777ea (patch) | |
| tree | 5fbda5fca7fecfa509e2955a220d08362441f2de | |
| parent | 4193d9163582b05e33aca3392e46649e5c3da8d1 (diff) | |
x86, UV: Use allocated buffer in tlb_uv.c:tunables_read()
The original code didn't check that the value returned from
snprintf() was less than the size of the buffer. Although it
didn't cause a runtime bug in this case, it makes the static
checkers complain.
Andrew Morton suggested a dynamically sized buffer would be
cleaner.
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dan Carpenter <error27@gmail.com>
Cc: Cliff Wickman <cpw@sgi.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Robin Holt <holt@sgi.com>
LKML-Reference: <20100929083118.GA6376@bicker>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/kernel/tlb_uv.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c index 312ef029281..33e77e4f7c8 100644 --- a/arch/x86/kernel/tlb_uv.c +++ b/arch/x86/kernel/tlb_uv.c @@ -1001,10 +1001,10 @@ static int uv_ptc_seq_show(struct seq_file *file, void *data) static ssize_t tunables_read(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { - char buf[300]; + char *buf; int ret; - ret = snprintf(buf, 300, "%s %s %s\n%d %d %d %d %d %d %d %d %d\n", + buf = kasprintf(GFP_KERNEL, "%s %s %s\n%d %d %d %d %d %d %d %d %d\n", "max_bau_concurrent plugged_delay plugsb4reset", "timeoutsb4reset ipi_reset_limit complete_threshold", "congested_response_us congested_reps congested_period", @@ -1012,7 +1012,12 @@ static ssize_t tunables_read(struct file *file, char __user *userbuf, timeoutsb4reset, ipi_reset_limit, complete_threshold, congested_response_us, congested_reps, congested_period); - return simple_read_from_buffer(userbuf, count, ppos, buf, ret); + if (!buf) + return -ENOMEM; + + ret = simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf)); + kfree(buf); + return ret; } /* |