23 lines
615 B
Diff
23 lines
615 B
Diff
--- utils.c
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+++ utils.c
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@@ -833,13 +833,19 @@
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{
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int ret;
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FILE *f;
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+ struct stat stat_buf;
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char fmt[20];
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char p[PATH_MAX];
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char real_loop_dev[PATH_MAX];
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if (!realpath(loop_dev, real_loop_dev))
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return -errno;
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- snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
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+
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+ if (stat(real_loop_dev, &stat_buf) || !S_ISBLK(stat_buf.st_mode))
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+ return -errno;
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+
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+ snprintf(p, PATH_MAX, "/sys/dev/block/%d:%d/loop/backing_file",
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+ major(stat_buf.st_rdev), minor(stat_buf.st_rdev));
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if (!(f = fopen(p, "r")))
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return -errno;
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