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From fd5b09c9a9107f0393ce194c4aac6e7b8f163e85 Mon Sep 17 00:00:00 2001
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From: Krzysztof Smolinski <krzysztof.smolinski@intel.com>
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Date: Fri, 16 Aug 2019 11:06:17 +0200
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Subject: [RHEL7.8 PATCH V2 35/47] mdadm: check value returned by snprintf
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against errors
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GCC 8 checks possible truncation during snprintf more strictly
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than GCC 7 which result in compilation errors. To fix this
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problem checking result of snprintf against errors has been added.
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Signed-off-by: Krzysztof Smolinski <krzysztof.smolinski@intel.com>
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Signed-off-by: Jes Sorensen <jsorensen@fb.com>
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---
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sysfs.c | 12 ++++++++++--
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1 file changed, 10 insertions(+), 2 deletions(-)
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diff --git a/sysfs.c b/sysfs.c
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index c313781..2995713 100644
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--- a/sysfs.c
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+++ b/sysfs.c
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@@ -1023,12 +1023,20 @@ int sysfs_rules_apply_check(const struct mdinfo *sra,
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char dname[MAX_SYSFS_PATH_LEN];
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char resolved_path[PATH_MAX];
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char resolved_dir[PATH_MAX];
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+ int result;
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if (sra == NULL || ent == NULL)
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return -1;
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- snprintf(dname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/", sra->sys_name);
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- snprintf(fname, MAX_SYSFS_PATH_LEN, "%s/%s", dname, ent->name);
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+ result = snprintf(dname, MAX_SYSFS_PATH_LEN,
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+ "/sys/block/%s/md/", sra->sys_name);
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+ if (result < 0 || result >= MAX_SYSFS_PATH_LEN)
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+ return -1;
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+
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+ result = snprintf(fname, MAX_SYSFS_PATH_LEN,
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+ "%s/%s", dname, ent->name);
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+ if (result < 0 || result >= MAX_SYSFS_PATH_LEN)
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+ return -1;
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if (realpath(fname, resolved_path) == NULL ||
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realpath(dname, resolved_dir) == NULL)
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--
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2.7.5
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