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>
Cc: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 536cd5a8042245f4ad46929a256098e047d745dd..1c3759bab80be73f7f5f6b70bdbaca12b4c6bb93 100644 (file)
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -4003,13 +4003,12 @@ 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);