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net: dsa: ensure port names are NULL-terminated after DSA_PORT_NAME_LENGTH truncation

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strncpy() simply bails out when copying a source string whose size
exceeds the destination string size, potentially leaving the destination
string unterminated.

One possible way to address is to pass DSA_PORT_NAME_LENGTH - 1 and a
previously zero-initialized destination string, but this is more
difficult to maintain.

The chosen alternative is to use strlcpy(), which properly limits the
copy len in the (srclen >= size) case to "size - 1", and which is also
more efficient than the strncpy() byte-by-byte implementation by using
memcpy. The destination string returned by strlcpy() is always NULL
terminated.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
This commit is contained in:
Vladimir Oltean 2021-09-27 14:22:03 +03:00 committed by Ramon Fried
parent c9131fc72b
commit 4fdc7e3530
1 changed files with 2 additions and 2 deletions
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4
net/dsa-uclass.c
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@ -216,7 +216,7 @@ static int dsa_port_of_to_pdata(struct udevice *pdev)
label = ofnode_read_string(dev_ofnode(pdev), "label");
if (label)
strncpy(port_pdata->name, label, DSA_PORT_NAME_LENGTH);
strlcpy(port_pdata->name, label, DSA_PORT_NAME_LENGTH);
eth_pdata = dev_get_plat(pdev);
eth_pdata->priv_pdata = port_pdata;
@ -421,7 +421,7 @@ static int dsa_post_bind(struct udevice *dev)
struct dsa_port_pdata *port_pdata;
port_pdata = dev_get_parent_plat(pdev);
strncpy(port_pdata->name, name, DSA_PORT_NAME_LENGTH);
strlcpy(port_pdata->name, name, DSA_PORT_NAME_LENGTH);
pdev->name = port_pdata->name;
}