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libata: prevent devices with blank model names from being DMA blacklisted

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The strn_pattern_cmp routine does not handle a blank name parameter
properly. The only patterns which should match a blank name are "*"
and an explicit "". If the function is passed a blank name in current
code, it will always match against the patt parameter. The bug manifests
itself as the device with the empty model name always matching the first
device in the DMA blacklist, forcing it to revert to PIO mode.

Signed-off-by: Andrew Paprocki <andrew@ishiboo.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Andrew Paprocki 2007-10-15 15:43:12 -04:00 committed by Jeff Garzik
parent 8f73a68801
commit 317b50b8ad
1 changed files with 7 additions and 1 deletions
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8
drivers/ata/libata-core.c
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@ -4014,8 +4014,14 @@ int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
p = strchr(patt, wildchar);
if (p && ((*(p + 1)) == 0))
len = p - patt;
else
else {
len = strlen(name);
if (!len) {
if (!*patt)
return 0;
return -1;
}
}
return strncmp(patt, name, len);
}