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authorJonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>2019-02-14 01:15:56 +0100
committerJens Axboe <axboe@kernel.dk>2019-04-06 11:09:12 -0600
commite2821a50b17c1b760e7d597777de61241f22fd55 (patch)
treea92e4a333d81bed796ef279801619da4aaf4b75b /block/sed-opal.c
parent1b6b75b0137fd2b5af533eceba5f5db62b1c45b0 (diff)
downloadlinux-e2821a50b17c1b760e7d597777de61241f22fd55.tar.bz2
block: sed-opal: unify space check in add_token_*
All add_token_* functions have a common set of conditions that have to be checked. Use a common function for those checks in order to avoid different behaviour as well as code duplication. Acked-by: Jon Derrick <jonathan.derrick@intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Scott Bauer <sbauer@plzdonthack.me> Co-authored-by: David Kozub <zub@linux.fjfi.cvut.cz> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de> Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/sed-opal.c')
-rw-r--r--block/sed-opal.c25
1 files changed, 16 insertions, 9 deletions
diff --git a/block/sed-opal.c b/block/sed-opal.c
index e59ae364f1ef..d285bd4b2b9b 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -510,15 +510,24 @@ static int opal_discovery0(struct opal_dev *dev, void *data)
return opal_discovery0_end(dev);
}
-static void add_token_u8(int *err, struct opal_dev *cmd, u8 tok)
+static bool can_add(int *err, struct opal_dev *cmd, size_t len)
{
if (*err)
- return;
- if (cmd->pos >= IO_BUFFER_LENGTH - 1) {
- pr_debug("Error adding u8: end of buffer.\n");
+ return false;
+
+ if (len > IO_BUFFER_LENGTH || cmd->pos > IO_BUFFER_LENGTH - len) {
+ pr_debug("Error adding %zu bytes: end of buffer.\n", len);
*err = -ERANGE;
- return;
+ return false;
}
+
+ return true;
+}
+
+static void add_token_u8(int *err, struct opal_dev *cmd, u8 tok)
+{
+ if (!can_add(err, cmd, 1))
+ return;
cmd->cmd[cmd->pos++] = tok;
}
@@ -562,9 +571,8 @@ static void add_token_u64(int *err, struct opal_dev *cmd, u64 number)
msb = fls64(number);
len = DIV_ROUND_UP(msb, 8);
- if (cmd->pos >= IO_BUFFER_LENGTH - len - 1) {
+ if (!can_add(err, cmd, len + 1)) {
pr_debug("Error adding u64: end of buffer.\n");
- *err = -ERANGE;
return;
}
add_short_atom_header(cmd, false, false, len);
@@ -586,9 +594,8 @@ static void add_token_bytestring(int *err, struct opal_dev *cmd,
is_short_atom = false;
}
- if (len >= IO_BUFFER_LENGTH - cmd->pos - header_len) {
+ if (!can_add(err, cmd, header_len + len)) {
pr_debug("Error adding bytestring: end of buffer.\n");
- *err = -ERANGE;
return;
}