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author | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2019-03-28 11:16:26 +0100 |
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committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2019-03-28 11:16:26 +0100 |
commit | 6f01eb5bf8e8110ab5f3a8e7b0f3abf19a205e4b (patch) | |
tree | 4b3147335ed97e4b487fd84bcb7a959a38d9656e /drivers/char/applicom.c | |
parent | 8f234193b8cc35c44614e4a4b05f2d920ff562e4 (diff) | |
parent | 6b50202a4d53bf527c640467bcff68b50a5e38a2 (diff) |
Merge tag 'v4.4.177' into toradex_vf_4.4-nextColibri-VF_LXDE-Image_2.8b6.183-20190331
This is the 4.4.177 stable release
Diffstat (limited to 'drivers/char/applicom.c')
-rw-r--r-- | drivers/char/applicom.c | 35 |
1 files changed, 24 insertions, 11 deletions
diff --git a/drivers/char/applicom.c b/drivers/char/applicom.c index 14790304b84b..9fcd51095d13 100644 --- a/drivers/char/applicom.c +++ b/drivers/char/applicom.c @@ -32,6 +32,7 @@ #include <linux/wait.h> #include <linux/init.h> #include <linux/fs.h> +#include <linux/nospec.h> #include <asm/io.h> #include <asm/uaccess.h> @@ -386,7 +387,11 @@ static ssize_t ac_write(struct file *file, const char __user *buf, size_t count, TicCard = st_loc.tic_des_from_pc; /* tic number to send */ IndexCard = NumCard - 1; - if((NumCard < 1) || (NumCard > MAX_BOARD) || !apbs[IndexCard].RamIO) + if (IndexCard >= MAX_BOARD) + return -EINVAL; + IndexCard = array_index_nospec(IndexCard, MAX_BOARD); + + if (!apbs[IndexCard].RamIO) return -EINVAL; #ifdef DEBUG @@ -697,6 +702,7 @@ static long ac_ioctl(struct file *file, unsigned int cmd, unsigned long arg) unsigned char IndexCard; void __iomem *pmem; int ret = 0; + static int warncount = 10; volatile unsigned char byte_reset_it; struct st_ram_io *adgl; void __user *argp = (void __user *)arg; @@ -711,16 +717,12 @@ static long ac_ioctl(struct file *file, unsigned int cmd, unsigned long arg) mutex_lock(&ac_mutex); IndexCard = adgl->num_card-1; - if(cmd != 6 && ((IndexCard >= MAX_BOARD) || !apbs[IndexCard].RamIO)) { - static int warncount = 10; - if (warncount) { - printk( KERN_WARNING "APPLICOM driver IOCTL, bad board number %d\n",(int)IndexCard+1); - warncount--; - } - kfree(adgl); - mutex_unlock(&ac_mutex); - return -EINVAL; - } + if (cmd != 6 && IndexCard >= MAX_BOARD) + goto err; + IndexCard = array_index_nospec(IndexCard, MAX_BOARD); + + if (cmd != 6 && !apbs[IndexCard].RamIO) + goto err; switch (cmd) { @@ -838,5 +840,16 @@ static long ac_ioctl(struct file *file, unsigned int cmd, unsigned long arg) kfree(adgl); mutex_unlock(&ac_mutex); return 0; + +err: + if (warncount) { + pr_warn("APPLICOM driver IOCTL, bad board number %d\n", + (int)IndexCard + 1); + warncount--; + } + kfree(adgl); + mutex_unlock(&ac_mutex); + return -EINVAL; + } |