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diff -rupN cryptsetup-1.7.4.bcp/lib/utils.c cryptsetup-1.7.4/lib/utils.c
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--- cryptsetup-1.7.4.bcp/lib/utils.c 2017-10-18 11:39:01.694902755 +0200
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+++ cryptsetup-1.7.4/lib/utils.c 2017-10-18 11:48:16.584868357 +0200
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@@ -252,21 +252,21 @@ ssize_t write_lseek_blockwise(int fd, in
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if (!frontPadBuf)
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goto out;
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- r = read_buffer(fd, frontPadBuf, bsize);
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- if (r < 0 || r != bsize)
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- goto out;
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-
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innerCount = bsize - frontHang;
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if (innerCount > count)
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innerCount = count;
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+ r = read_buffer(fd, frontPadBuf, bsize);
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+ if (r < (frontHang + innerCount))
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+ goto out;
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+
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memcpy(frontPadBuf + frontHang, buf, innerCount);
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if (lseek(fd, offset - frontHang, SEEK_SET) < 0)
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goto out;
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- r = write_buffer(fd, frontPadBuf, bsize);
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- if (r < 0 || r != bsize)
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+ r = write_buffer(fd, frontPadBuf, frontHang + innerCount);
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+ if (r != (frontHang + innerCount))
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goto out;
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buf = (char*)buf + innerCount;
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@@ -311,14 +311,14 @@ ssize_t read_lseek_blockwise(int fd, int
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if (!frontPadBuf)
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return ret;
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- r = read_buffer(fd, frontPadBuf, bsize);
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- if (r < 0 || r != bsize)
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- goto out;
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-
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innerCount = bsize - frontHang;
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if (innerCount > count)
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innerCount = count;
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+ r = read_buffer(fd, frontPadBuf, bsize);
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+ if (r < (frontHang + innerCount))
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+ goto out;
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+
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memcpy(buf, frontPadBuf + frontHang, innerCount);
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buf = (char*)buf + innerCount;
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