ipr: Fix out-of-bounds null overwrite

commit d63c7dd5bcb9441af0526d370c43a65ca2c980d9 upstream.

Return value of snprintf is not bound by size value, 2nd argument.
(https://www.kernel.org/doc/htmldocs/kernel-api/API-snprintf.html).
Return value is number of printed chars, can be larger than 2nd
argument.  Therefore, it can write null byte out of bounds ofbuffer.
Since snprintf puts null, it does not need to put additional null byte.

Signed-off-by: Insu Yun <wuninsu@gmail.com>
Reviewed-by: Shane Seymour <shane.seymour@hpe.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 4a79a5f0d95e9636b4ba86033e47ffa1948df04a..bde4771c1a59b588274e1bea9127378d6137a417 100644 (file)
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -3908,13 +3908,12 @@ static ssize_t ipr_store_update_fw(struct device *dev,
        struct ipr_sglist *sglist;
        char fname[100];
        char *src;
-       int len, result, dnld_size;
+       int result, dnld_size;
 
        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;
 
-       len = snprintf(fname, 99, "%s", buf);
-       fname[len-1] = '\0';
+       snprintf(fname, sizeof(fname), "%s", buf);
 
        if (request_firmware(&fw_entry, fname, &ioa_cfg->pdev->dev)) {
                dev_err(&ioa_cfg->pdev->dev, "Firmware file %s not found\n", fname);