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util/nvmutil: verify final offset in pwrite/pread

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Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-14 17:47:53 +00:00
parent 276b9d34e8
commit c02dfc4c33
1 changed files with 6 additions and 2 deletions
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8
util/nvmutil/nvmutil.c
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@@ -1952,6 +1952,7 @@ prw(int fd, void *mem, size_t nrw,
int loop_eagain, int loop_eintr)
{
off_t off_orig;
off_t off_last;
ssize_t r;
int saved_errno;
int positional_rw;
@@ -2022,11 +2023,14 @@ real_pread_pwrite:
|| errno == try_err(loop_eagain, EAGAIN)));
saved_errno = errno;
if (lseek_loop(fd, off_orig, SEEK_SET,
loop_eagain, loop_eintr) == (off_t)-1) {
off_last = lseek_loop(fd, off_orig, SEEK_SET,
loop_eagain, loop_eintr);
if (off_last == (off_t)-1) {
errno = saved_errno;
return -1;
}
if (off_last != off_orig)
goto err_prw;
errno = saved_errno;
return rw_over_nrw(r, nrw);