[PATCH 4/8] udf: improve error management in udf_CS0toUTF8()

From: Fabian Frederick
Date: Wed Apr 08 2015 - 15:23:54 EST


udf_CS0toUTF8() now returns -EINVAL on error.
udf_load_pvoldesc() and udf_get_filename() do the same.

Suggested-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Fabian Frederick <fabf@xxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/udf/super.c | 23 ++++++++++++++---------
fs/udf/unicode.c | 7 ++++---
2 files changed, 18 insertions(+), 12 deletions(-)

diff --git a/fs/udf/super.c b/fs/udf/super.c
index 6299f341967b..c6a8f5f79443 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -927,17 +927,22 @@ static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
#endif
}

- if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
- if (udf_CS0toUTF8(outstr, instr)) {
- strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
- outstr->u_len > 31 ? 31 : outstr->u_len);
- udf_debug("volIdent[] = '%s'\n",
- UDF_SB(sb)->s_volume_ident);
- }
+ if (!udf_build_ustr(instr, pvoldesc->volIdent, 32)) {
+ ret = udf_CS0toUTF8(outstr, instr);
+ if (ret < 0)
+ goto out_bh;
+
+ strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
+ outstr->u_len > 31 ? 31 : outstr->u_len);
+ udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
+ }

if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
- if (udf_CS0toUTF8(outstr, instr))
- udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
+ ret = udf_CS0toUTF8(outstr, instr);
+ if (ret < 0)
+ goto out_bh;
+
+ udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);

ret = 0;
out_bh:
diff --git a/fs/udf/unicode.c b/fs/udf/unicode.c
index 41c3bef1d226..35cc9477b066 100644
--- a/fs/udf/unicode.c
+++ b/fs/udf/unicode.c
@@ -89,7 +89,7 @@ static void udf_build_ustr_exact(struct ustr *dest, dstring *ptr, int exactsize)
* both of type "struct ustr *"
*
* POST-CONDITIONS
- * <return> Zero on success.
+ * <return> >= 0 on success.
*
* HISTORY
* November 12, 1997 - Andrew E. Mileski
@@ -112,7 +112,7 @@ int udf_CS0toUTF8(struct ustr *utf_o, const struct ustr *ocu_i)
memset(utf_o, 0, sizeof(struct ustr));
pr_err("unknown compression code (%d) stri=%s\n",
cmp_id, ocu_i->u_name);
- return 0;
+ return -EINVAL;
}

ocu = ocu_i->u_name;
@@ -350,7 +350,8 @@ int udf_get_filename(struct super_block *sb, uint8_t *sname, int slen,

udf_build_ustr_exact(unifilename, sname, slen);
if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
- if (!udf_CS0toUTF8(filename, unifilename)) {
+ ret = udf_CS0toUTF8(filename, unifilename);
+ if (ret < 0) {
udf_debug("Failed in udf_get_filename: sname = %s\n",
sname);
goto out2;
--
2.1.4


--OBd5C1Lgu00Gd/Tn--
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