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| author | Dong Du <Dd_nirvana@sjtu.edu.cn> | 2021-09-01 06:06:24 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2021-09-03 09:46:01 +0300 |
| commit | bd355213bfbb209c047e8cc0df56936f6705477f (patch) | |
| tree | 464818a5df66b9652c1a1e730e2f9ee8b37f4859 /lib | |
| parent | 1718b1642ee8c31eb2c49d78b5834e06f3324394 (diff) | |
| download | opensbi-bd355213bfbb209c047e8cc0df56936f6705477f.tar.xz | |
lib: sbi: Refine the way to construct platform features
sbi_platform_get_features_str() uses sbi_snprintf() to construct the
features_str. However, it passes the wrong length value (i.e., the nfstr),
which should be (nfstr-offset) as the starting point of str (i.e.,
features_str + offset) changes.
This commit also checks the return value of snprintf, and handles the
corner case that the string buffer is full.
Signed-off-by: Dong Du <Dd_nirvana@sjtu.edu.cn>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/sbi/sbi_platform.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/lib/sbi/sbi_platform.c b/lib/sbi/sbi_platform.c index 99bd8f5..445a8c1 100644 --- a/lib/sbi/sbi_platform.c +++ b/lib/sbi/sbi_platform.c @@ -48,9 +48,18 @@ void sbi_platform_get_features_str(const struct sbi_platform *plat, if (features & feat) { temp = sbi_platform_feature_id2string(feat); if (temp) { - sbi_snprintf(features_str + offset, nfstr, - "%s,", temp); - offset = offset + sbi_strlen(temp) + 1; + int len = sbi_snprintf(features_str + offset, + nfstr - offset, + "%s,", temp); + if (len < 0) + break; + + if (offset + len >= nfstr) { + /* No more space for features */ + offset = nfstr; + break; + } else + offset = offset + len; } } feat = feat << 1; |