forked from pool/s390-tools
b5ca2618dd
Implemented parallel formatting patches, other misc. changes OBS-URL: https://build.opensuse.org/request/show/535008 OBS-URL: https://build.opensuse.org/package/show/Base:System/s390-tools?expand=0&rev=22
70 lines
2.5 KiB
Diff
70 lines
2.5 KiB
Diff
From 1261105fe238ad306db29a9d47bb1a293bddf9aa Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Jan=20H=C3=B6ppner?= <hoeppner@linux.vnet.ibm.com>
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Date: Mon, 16 Oct 2017 15:46:07 +0200
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Subject: [PATCH] dasdinfo: Fix truncation warning
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Commit 3c80f7e025db ("dasdinfo: fix buffer overflow warning") changed a
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sprintf call to snprintf to avoid a buffer overflow warning. However,
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GCC 7 now warns about a potential truncation with snprintf:
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dasdinfo.c: In function 'main':
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dasdinfo.c:577:18: warning: '%s' directive output may be truncated
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writing up to 255 bytes into a region of size 69 [-Wformat-truncation=]
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"/sys/block/%s/device/uid", dir_entry->d_name);
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^~
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dasdinfo.c:576:4: note: 'snprintf' output between 23 and 278 bytes into
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a destination of size 80
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snprintf(*uidfile, RD_BUFFER_SIZE,
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^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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"/sys/block/%s/device/uid", dir_entry->d_name);
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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We could get around this by increasing the buffer. Though, the current
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buffer size is already plenty and we know better anyway.
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Avoid the warning by simply checking the return value of snprintf and
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display an error in case data was truncated nonetheless.
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Fixes: 3c80f7e025db ("dasdinfo: fix buffer overflow warning")
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Signed-off-by: Jan Höppner <hoeppner@linux.vnet.ibm.com>
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Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
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---
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dasdinfo/dasdinfo.c | 12 ++++++++++--
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1 file changed, 10 insertions(+), 2 deletions(-)
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diff --git a/dasdinfo/dasdinfo.c b/dasdinfo/dasdinfo.c
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index c8bda3b..f881f03 100644
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--- a/dasdinfo/dasdinfo.c
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+++ b/dasdinfo/dasdinfo.c
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@@ -545,6 +545,7 @@ static int dinfo_get_uid_from_devnode(char **uidfile, char *devnode)
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char *readbuf;
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DIR *directory = NULL;
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struct dirent *dir_entry = NULL;
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+ int rc = 0;
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if (stat(devnode, &stat_buffer) != 0) {
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printf("Error: could not stat %s\n", devnode);
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@@ -573,8 +574,15 @@ static int dinfo_get_uid_from_devnode(char **uidfile, char *devnode)
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if (strncmp(stat_dev, readbuf,
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MAX(strlen(stat_dev), strlen(readbuf)-1)) == 0) {
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- snprintf(*uidfile, RD_BUFFER_SIZE,
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- "/sys/block/%s/device/uid", dir_entry->d_name);
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+ rc = snprintf(*uidfile, RD_BUFFER_SIZE,
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+ "/sys/block/%s/device/uid",
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+ dir_entry->d_name);
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+ if (rc >= RD_BUFFER_SIZE) {
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+ fprintf(stderr,
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+ "Error: Device name was truncated\n");
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+ return -1;
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+ }
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+
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break;
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}
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}
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--
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1.7.12.4
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