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| author | Antonio Ospite <ospite@studenti.unina.it> | 2010-10-05 17:20:17 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2010-10-06 11:30:34 +0200 |
| commit | e42dee9a99a3ecd32b5c027e8f7411fb5bc11eb6 (patch) | |
| tree | 98ddb05e7f8eb8420ad376d3c8ef8f2a993659ea /drivers/hid | |
| parent | d20d5ffab92f00188f360c44c791a5ffb988247c (diff) | |
| download | linux-e42dee9a99a3ecd32b5c027e8f7411fb5bc11eb6.tar.bz2 | |
HID: hidraw, fix a NULL pointer dereference in hidraw_write
BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
IP: [<ffffffffa0f0a625>] hidraw_write+0x3b/0x116 [hid]
[...]
This is reproducible by disconnecting the device while userspace writes
to dev node in a loop and doesn't check return values in order to exit
the loop.
Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Cc: stable@kernel.org
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/hidraw.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c index 9eaf6ae5f97f..a3866b5c0c43 100644 --- a/drivers/hid/hidraw.c +++ b/drivers/hid/hidraw.c @@ -109,6 +109,12 @@ static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t int ret = 0; mutex_lock(&minors_lock); + + if (!hidraw_table[minor]) { + ret = -ENODEV; + goto out; + } + dev = hidraw_table[minor]->hid; if (!dev->hid_output_raw_report) { |