mdadm/Monitor: Fix NULL pointer dereference when stat2devnm return NULL
Wait(): stat2devnm() returns NULL for non block devices. Check the pointer is valid derefencing it. This can happen when using --wait, such as the 'f' and 'd' file type, causing a core dump. such as: ./mdadm --wait /dev/md/ Reviewed-by: NeilBrown <neilb@suse.com> Signed-off-by: Zhilong Liu <zlliu@suse.com> Signed-off-by: Jes Sorensen <Jes.Sorensen@gmail.com>
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@ -994,6 +994,7 @@ int Wait(char *dev)
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{
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struct stat stb;
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char devnm[32];
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char *tmp;
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int rv = 1;
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int frozen_remaining = 3;
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@ -1002,7 +1003,12 @@ int Wait(char *dev)
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strerror(errno));
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return 2;
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}
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strcpy(devnm, stat2devnm(&stb));
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tmp = stat2devnm(&stb);
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if (!tmp) {
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pr_err("%s is not a block device.\n", dev);
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return 2;
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}
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strcpy(devnm, tmp);
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while(1) {
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struct mdstat_ent *ms = mdstat_read(1, 0);
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