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ld_iscsi: don't try to read beyond last lba

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This commit is contained in:
Jon Grimm
2012-09-14 12:22:07 -05:00
parent eb90ab98c1
commit 74496e36fd
1 changed files with 12 additions and 1 deletions
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13
src/ld_iscsi.c
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@@ -252,7 +252,7 @@ ssize_t read(int fd, void *buf, size_t count)
{
if ((iscsi_fd_list[fd].is_iscsi == 1) && (iscsi_fd_list[fd].in_flight == 0)) {
uint64_t offset;
uint32_t num_blocks;
uint32_t num_blocks, lba;
struct scsi_task *task;
if (iscsi_fd_list[fd].dup2fd >= 0) {
@@ -260,6 +260,17 @@ ssize_t read(int fd, void *buf, size_t count)
}
offset = iscsi_fd_list[fd].offset / iscsi_fd_list[fd].block_size * iscsi_fd_list[fd].block_size;
num_blocks = (iscsi_fd_list[fd].offset - offset + count + iscsi_fd_list[fd].block_size - 1) / iscsi_fd_list[fd].block_size;
lba = offset / iscsi_fd_list[fd].block_size;
/* Don't try to read beyond the last LBA */
if (lba >= iscsi_fd_list[fd].num_blocks) {
return 0;
}
/* Trim num_blocks requested to last lba */
if ((lba + num_blocks) > iscsi_fd_list[fd].num_blocks) {
num_blocks = iscsi_fd_list[fd].num_blocks - lba;
count = num_blocks * iscsi_fd_list[fd].block_size;
}
iscsi_fd_list[fd].in_flight = 1;
task = iscsi_read10_sync(iscsi_fd_list[fd].iscsi, iscsi_fd_list[fd].lun, offset / iscsi_fd_list[fd].block_size, num_blocks * iscsi_fd_list[fd].block_size, iscsi_fd_list[fd].block_size, 0, 0, 0, 0, 0);