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ipr: Fix out-of-bounds null overwrite

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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>
This commit is contained in:
Insu Yun 2016-01-06 12:44:01 -05:00 committed by Greg Kroah-Hartman
parent 91b95d59aa
commit a918d2bcea
1 changed files with 2 additions and 3 deletions
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5
drivers/scsi/ipr.c
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@ -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);